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-   -   A380 - the best is yet to come (https://www.pprune.org/rumours-news/611211-a380-best-yet-come.html)

rog747 23rd Jul 2018 17:39

i wonder what BA will do? their 380 fleet (13?) is now quite niche

the config is F14 C97 W55 Y303

stay with 777 787 and now 350's?

the 767's are almost gone and now 3 leased 773's have been taken to replace the oldest trio of GE90 non ER 772 a/c

always amazed me that the likes of BA VS KL SA ANZ CX and QF did not go for the 747-800 and get Mr B to give them a very good deal and maybe take their 744's in return

Akrapovic 23rd Jul 2018 18:18


always amazed me that the likes of BA VS KL SA ANZ CX and QF did not go for the 747-800 and get Mr B to give them a very good deal and maybe take their 744's in return
Not me. The -8's are hugely expensive. Twin-engined widebody's are the future. . . .

Turbine D 23rd Jul 2018 20:12

The Denver International Airport Authority isn't undertaking a multiyear expansion, adding 39 new gates for pending arrivals of Boeing or Airbus jumbos, but it does give good indication which direction airlines are headed in terms of aircraft sizes...

richardwpprn 23rd Jul 2018 21:34


Originally Posted by rog747 (Post 10204127)
i wonder what BA will do?...

It wouldn’t surprise me if IAG are looking for a great A380 and A350 deal from Airbus and keeping Boeing interested with their B777X offerings, There are reports BA managers have enjoyed recent IB A350 LHR-MAD flights.

Less Hair 24th Jul 2018 06:45

What makes China not buy more significant numbers of A380s? They have the market, the airports, the routes and the money.

White Knight 24th Jul 2018 07:30


Originally Posted by Monarch Man
In practice when I’m rotating in my 777, the 777 behind me receives a takeoff clearance, and so on and so on, diverging SIDS are planned so one turns left, the next turns right

In practice when I'm rotating in my 380, the 380 behind me receives a takeoff clearance, and so on and so on.

You still have time separation behind a Triple when 320 or 737s are next in line...


Originally Posted by KenV
2. Airlines also make money moving freight in the belly. To profit in that environment requires a single deck aircraft. Double deckers tend to fill their belly with passenger luggage.

Sadly, as superb as the airplane is, the A380 violates both points 1 and 2.

I've often had 600 plus pax plus all of their bags plus 25 tonnes of freight. The 380 can carry the weight- the problem is bulky stuff like a whole Ferrari!

Cleared Visual 24th Jul 2018 07:46


Originally Posted by underfire (Post 10203827)
While the Lazy B keeps pumping out the 737 series, the miscues certainly have cost them dearly...757, 767, 748, and losing the C Series. The Embraer deal is a bit amusing, but C919 and ARJ21 ill have to be dealt with.

I would hardly call the 767 a miscue, with over 1,100 built so far (more prolific than the 707) and a healthy backlog of orders for new build freighters, I think a production run sustained for 40+ years is a mark of a great success!

Groundloop 24th Jul 2018 08:34


i wonder what BA will do? their 380 fleet (13?) is now quite niche
BA have stated quite a few times that they would like to enlarge their 380 fleet - if the price was right!

RexBanner 24th Jul 2018 08:52

BA have had discussions with Airbus about the A380 and a couple of other European airlines who are desperate to get rid of theirs. However they’ve told Airbus that they’ll only take them for their break even price, which would reduce the chances of a deal somewhat I would imagine. Otherwise they’re keen on the 777X due to their engine options not being manufactured by a certain Derbyshire based company. Heard all of this from as close to the source’s mouth as it’s possible to get just before a LHR-DUB flight recently.

davews 24th Jul 2018 09:26

Well for those of you who went to Farnborough last week the A380 was certainly centre stage - although it did seem to be a plug for Global Warming being festooned in livery forecasting that the Coral Reefs will be gone by 2050. Tours for the public inside but when I passed on Saturday it seemed to be just for the privileged few. Also the new A350-1000 which flew in the air displays doing acrobatics I hope none of you pilots do when you have real passengers aboard. I certainly didn't get the impression that its days are numbered.

birmingham 24th Jul 2018 10:41

The economics are a challenge if the aircraft isn't filled and fuel prices are low. So airline managers (largely risk averse, systematised creatures these days) have generally given it a wide berth. If oil goes back above $100 (and recent history has shown nobody can accurately forecast that) and the industry gains a bit of confidence then there is certainly a place for both the 380s and the smaller twins. Given a choice between economy in a 787 and an A380 I know which I would rather travel in. But passenger preference is increasingly less relevant to the industry's calculations.

KenV 24th Jul 2018 13:12


Originally Posted by White Knight (Post 10204494)
I've often had 600 plus pax plus all of their bags plus 25 tonnes of freight. The 380 can carry the weight- the problem is bulky stuff like a whole Ferrari!

It's not a matter of mass. It's a question of volume. Passenger baggage is low density, taking up lots of space without weighing all that much. The lower lobe (cargo deck) volume of an A380 is actually LESS than 777-300ER's lower lobe volume (175.3 cuM vs 201.6 cuM). But since the A380 is a double deck above, it carries far more people so that lower lobe is filled with much more luggage, leaving little space for freight. How much freight weight can be carried depends on both the number of passengers aboard and the distance to be flown. As a comparison, according to Emirates, on the city-pairs they operate, an A380 with a full pax load the average freight capacity is 50 cuM and 8000 kgs and for a 777-300ER with a full pax load it's 125 cuM and 23,000 kg. That's a huge difference in freight capacity for the much "smaller" aircraft. And freight generates serious profits. And that's why airlines buy airplanes. To make money. And here's the troublesome part: Boeing is coming out with a bigger and significantly more efficient version of the 777 which will further shrink the A380s market niche and further shrink its profitability. The business case for stretching/upgrading the A380 is non existent, even if Airbus magically found the resources to do so.

Again, addressing the secondary market, if you turn an A380 into a high density passenger hauler serving the charter market, can you fit all the passengers' luggage into the cargo hold, or are you going to have to restrict the amount of baggage passengers can bring aboard? Crunch the numbers: an Emirates A380 in three class configuration fills 75% of its cargo volume with baggage and has 25% cargo volume margin for freight. That means a high density configuration that carries more than 25% additional passengers than the Emirates configuration will not have room for all the baggage unless there are baggage restrictions. How will that sell?

Douglas seriously looked at a double decker when they designed the MD-12. The economics did not make sense and it was never built. It seems Airbus was too intent on "one upping" Boeing and pressed ahead with a slightly bigger aircraft than the MD-12 and thus would have an even smaller (and more questionable) niche market. And so here they are, with "the best yet to come." Yah shur.

CargoOne 24th Jul 2018 13:13


Originally Posted by RexBanner (Post 10204557)
BA have had discussions with Airbus about the A380 and a couple of other European airlines who are desperate to get rid of theirs. However they’ve told Airbus that they’ll only take them for their break even price, which would reduce the chances of a deal somewhat I would imagine.

Well BA is getting two more a380s soon but this time in shape of wetlease from HiFly

KenV 24th Jul 2018 13:30


Originally Posted by birmingham (Post 10204656)
The economics are a challenge if the aircraft isn't filled and fuel prices are low. So airline managers (largely risk averse, systematised creatures these days) have generally given it a wide berth. If oil goes back above $100.....

Very unlikely. Texas by itself is scheduled to become the world's number 3 producer of oil by 2019. The Permian Basin (west Texas) is growing very fast with oil that is profitable at $40 per barrel. The biggest constraint in the Permian is pipe capacity, and there are a number of pipelines scheduled to come on line soon. The Eagle Ford (south Texas) has even more oil than the Permian and is only slightly more expensive to drill and pump, with the costs going steadily down. Eagle Ford is in the early development stages relative to Permian, so over time there will be more and more oil available. OPEC can no longer control the price of oil and their ability to do so will only decrease over time. And that's just Texas. There is LOTS more oil in other states as well as Canada. And Trump has authorized that pipeline from Canada to the Texas coast that Obama killed.

The demand for oil is rising steadily. But the supply is rising faster. That means steady or declining prices.

Icarus2001 24th Jul 2018 14:15


The economics are a challenge if the aircraft isn't filled and fuel prices are low.
Can you explain why low fuel fuel prices work against the A380? Given that it is a thirsty bird with four engines burning compared to say the B777 or B787 or A350?

Sailvi767 24th Jul 2018 14:34

The charter market for the A380 is limited by the airports that can support it. That is why Boeing is going to fold the wings on the 777. It’s not fun to sit burning fuel for 10 extra minutes waiting for a A380 coming the other way on a parallel taxiway and that’s at JFK! The fact they seem to taxi at 5 knots does not help.

Volume 25th Jul 2018 06:54


Given that it is a thirsty bird with four engines burning compared to say the B777 or B787 or A350?
Of course it is more thirsty, it is bigger.
If fully loaded and on the mission it is designed for, the a380 burns less fuel per passenger than the 777. 787/A350 are newer design with newer technology, so they do indeed burn less per passenger.
It is not the number of engines, and if exceeding a certain size, there is no other option than having 4 engines.


Given a choice between economy in a 787 and an A380 I know which I would rather travel in.
Given the choice between a non-stop flight on a 787 and a flight via a hub to fill an A380 I would exactly know what I would travel in: In the A350 nonstop ;)


But since the A380 is a double deck above, it carries far more people so that lower lobe is filled with much more luggage, leaving little space for freight.
There probably is agood reason (or actually two more...) why Boeing never changed the 747 to full double deck. Looking at the dreamlifter, they may have been able to do so, but actually it does not make sense.
Airbus once had a major market advantage for the A300 compared to the Boeing products, because they offered more cargo space which allowed the airlines to do additional profit. On the A380 they did the opposite, and it hurts. Initially they went for a conventional environmental control arrangement, but later moved it to the wing roots to gain some more cargo space. They also (compared to the 747) selected a body gear arrangement which allows additional cargo space between, still it is not that much.


That is why Boeing is going to fold the wings on the 777.
They still have to proof that this does not only look like a clever design, but actually works in real service life... Adding complexity rarely pays off.

nomorecatering 25th Jul 2018 10:51

I'm going to go out on a limb and say both the 747 and A380 will continue on for a very long time. The 747 will get some further tweeks, the A380 will get a longer fuselage. Airport planners in Asia are already talking about designs for airports and terminals which will see 500+ million pax per year. The new twins are magnificent air frames, but they are not the 747 or A380. Their demise is greatly exaggerated to paraphrase the well know quote.

KenV 25th Jul 2018 11:04


Originally Posted by Volume (Post 10205437)
There probably is a good reason (or actually two more...) why Boeing never changed the 747 to full double deck. Looking at the dreamlifter, they may have been able to do so, but actually it does not make sense.

The dreamlifter is mostly non pressurized, so not applicable. Boeing chose to stretch the 747 fuselage rather than just extend the upper deck because they wanted to increase passenger AND freight capacity. Extending just the upper deck increases passenger capacity while reducing freight capacity.



Airbus once had a major market advantage for the A300 compared to the Boeing products, because they offered more cargo space which allowed the airlines to do additional profit. On the A380 they did the opposite, and it hurts. Initially they went for a conventional environmental control arrangement, but later moved it to the wing roots to gain some more cargo space.
In Boeing aircraft "a conventional environmental control arrangement" puts the system in the wing to body fairings OUTside of the fuselage, so it does not reduce cargo hold capacity.


They also (compared to the 747) selected a body gear arrangement which allows additional cargo space between, still it is not that much.
That's the big advantage of the 777 vis a vis cargo space. There is no body gear. With the exception of the centerwing structure, the entire lower lobe is available for cargo. No gear retracting into the body.



They still have to proof that this does not only look like a clever design, but actually works in real service life... Adding complexity rarely pays off.
The folding wing design on the 777X is exceptionally simple. The flap system on a 747 is far far more complex and "actually works in real service life." For that matter the landing gear retraction/extension system on a typical airliner is far more complex than the 777's wing fold mechanism and they certainly "actually work in real service life."

KenV 25th Jul 2018 11:10


Originally Posted by nomorecatering (Post 10205638)
I'm going to go out on a limb and say both the 747 and A380 will continue on for a very long time. The 747 will get some further tweeks, the A380 will get a longer fuselage. Airport planners in Asia are already talking about designs for airports and terminals which will see 500+ million pax per year. The new twins are magnificent air frames, but they are not the 747 or A380. Their demise is greatly exaggerated to paraphrase the well know quote.

You may be right, but on the other hand......
1. The 747-8I (the passenger model) is essentially done. Only 747-8Fs are selling.
2. The business case for stretching the A380 is non existent. The base design needs to be profitable before major upgrades like new engines or stretch configurations can even be contemplated. And the base design is simply not making a profit for Airbus.

TURIN 25th Jul 2018 12:07


Originally Posted by sandiego89 (Post 10203946)
Your 777 ride was more "bumpy, rattley and noisy" than your Dash 8 ride???? Were you in the engine nacelle? :)

Hard to believe I know, but seriously, I was sat at the back of the Dash 8 and it was smooth as silk. Business class in the 777 was very noisy and juddery in comparison, it wasn't turbulence either.

TURIN 25th Jul 2018 12:11


That's the big advantage of the 777 vis a vis cargo space. There is no body gear. With the exception of the centerwing structure, the entire lower lobe is available for cargo. No gear retracting into the body.
Come again?


trancada 25th Jul 2018 12:36


Originally Posted by Sailvi767 (Post 10204873)
The charter market for the A380 is limited by the airports that can support it. That is why Boeing is going to fold the wings on the 777. It’s not fun to sit burning fuel for 10 extra minutes waiting for a A380 coming the other way on a parallel taxiway and that’s at JFK! The fact they seem to taxi at 5 knots does not help.


Lets see the business progress of HIFLY, in the charter and ACMI market.

Icarus2001 25th Jul 2018 12:52


Of course it is more thirsty, it is bigger.
If fully loaded and on the mission it is designed for, the a380 burns less fuel per passenger than the 777. 787/A350 are newer design with newer technology, so they do indeed burn less per passenger.
It is not the number of engines, and if exceeding a certain size, there is no other option than having 4 engines.
Thanks for stating the obvious and managing to not answer my question at the same time.

MrDK 25th Jul 2018 13:14


Originally Posted by surely not (Post 10200272)
It will be interesting to see if the 2nd hand market for A380 attracts a charter operator who utilises the full 800+ capacity. That might make quite a difference. One A380 instead of 4 x B737/A320. It isn't unusual to see 3 or 4 operators operating the same route at a similar time. Could one operator of an A380 take the prize?

That appears to be a pipe dream.
Malaysia Airlines was unable to offload six aircrafts
It made plans for a charter business of their own, that went nowhere.

Thai Airways disputably was trying to sell six frames could not find buyers for its six A380's

The first two retired Singapore Airlines A380's are being scrapped, after just 10 years of service
Searching for buyers failed, active negotiations included British Airways, Iran Air and Hi Fly (charter)
There were reports that Hi Fly would lease the two frames (Apr 2018), but later (June 2018) Dr. Peters (owners) confirmed the plan to scrap.

What a second hand market that is!

swh 25th Jul 2018 14:43


Originally Posted by MrDK (Post 10205766)

The first two retired Singapore Airlines A380's are being scrapped, after just 10 years of service
!

They were the earliest A380s much heavier and with all of the custom wiring rework. In comparison Boeing were unable to find a buyer for No. 4 and No. 5 787s and wrote off the aircraft in 2016 for $1.235 billion as a development expense. They also were heavier with lots of rework. The earlier 787s were placed in museums.

KenV 25th Jul 2018 14:57


Originally Posted by TURIN (Post 10205700)

Look more closely at that video. Those are wing mounted landing gear retracting into the area between the wings. Both the 747 and the A380 have four main gear legs: two mounted on the wings (like the 777) plus two mounted on the fuselage. Those body gear eat into the cargo hold volume. The 777 does not have such body gear which gives it an advantage in hauling belly freight.

KenV 25th Jul 2018 15:22

I keep seeing this claim that the A380 reduces congestion at major hubs. i seriously question that. This is ONLY true if every passenger on board an A380 has as their home point or final destination the major hub. Those passengers that either live farther away from the hub or whose destination is farther from the hub need to be fed to and from the hub on smaller aircraft. So every A380 flight may require two, three, or more feeder flights both into and out of BOTH hubs by smaller feeder aircraft. That INcreases congestion. Smaller long range aircraft (like A350 and 787) truly reduce congestion at the hubs by enabling a direct flight from the feeder airport to another feeder airport, entirely eliminating the need to stop at the congested hub. A380 only makes sense in a hub and spoke system and planes like the A350 and 787 are disrupting the hub and spoke system.

So when someone asks: "Would you rather fly an A380 or a 787/A350" the real question should be "would you rather fly in a 737/A320 then an A380 and then a 737/A320 or just fly direct in an A350/787?" The answer should be obvious.

DaveReidUK 25th Jul 2018 16:00


Originally Posted by KenV (Post 10205896)
So when someone asks: "Would you rather fly an A380 or a 787/A350" the real question should be "would you rather fly in a 737/A320 then an A380 and then a 737/A320 or just fly direct in an A350/787?" The answer should be obvious.

It would be interesting to see just how many 787/A350 routes don't have a hub at either one end or the other, which is what the above implies.

KenV 25th Jul 2018 18:40


Originally Posted by DaveReidUK (Post 10205924)
It would be interesting to see just how many 787/A350 routes don't have a hub at either one end or the other, which is what the above implies.

You missed my point. A380 pretty much MUST operate out of major hubs. 787/A350 MAY operate out of major hubs, but also MAY operate out of much smaller airports. What's that mean? The A380 is restricted to a market niche and must compete against 747/777/787/A350 in that niche. 787/A350 operate in a much larger market and for a good portion of that market do not have to compete against the A380 at all.

DaveReidUK 25th Jul 2018 19:39


Originally Posted by KenV (Post 10206069)
You missed my point.

And you in turn have missed mine.

You are implying that the alternative to a point-to-point direct flight on a 787/A350 would necessitate a 3-leg itinerary from the origin to Hub A, then onward to Hub B, and finally to the destination.

I'm suggesting that there are relatively few city pairs that currently require 3 legs to get between but which would nevertheless be capable (traffic-wise) of supporting a direct service. So it's not really a valid comparison.

And yes, I'm aware of the difference between the markets that the A380 is targeted at and those for the 787/A350.

20driver 25th Jul 2018 20:50

As several have pointed out here, the market and the punters have spoken. My first flight from EWR to the UK, to get to Belfast, was on a 747 to London 30 years ago . Right now there are many non stops to the UK and Ireland from NYC area. All on twins. Belfast, Dublin, Glasgow, Edinburgh, Manchester, Cork !! , have a least one non stop. You can call NYC a hub, but most of the destinations outside of London are not.
Another factor is not only what a twin can do , but the old treaties forced airlines to funnel through a national hub. That is no more. Who would have imagined flying from Cork to New York on a 737 even 10 years ago? Another factor no one has mentioned here is landing fees and costs. The more connections, the more someone has to pay. Which is interesting as the non stops are sometimes more expensive than a connecting flight. That tells me airlines can get a premium by saving people time.
The A380 may be a great plane, but it was the wrong bet. One item I read years back was Boeing figured the weight penalty of the second floor with the drag of the bigger fuselage (function of the area, the square of the tube diameter) and the 4 engines was always going to make the double decker an non starter.
Lucky or good, Boeing got it right.
20driver

MrDK 25th Jul 2018 22:17


Originally Posted by swh (Post 10205863)
They were the earliest A380s much heavier and with all of the custom wiring rework. In comparison Boeing were unable to find a buyer for No. 4 and No. 5 787s and wrote off the aircraft in 2016 for $1.235 billion as a development expense. They also were heavier with lots of rework. The earlier 787s were placed in museums.

That of course makes sense, but about Malaysia Airlines who could not find buyers for six frames and if true that Thai Airways wanted to sell, it was in the same situation.
Add Amedeo Leasing which will be sitting on twelve A380's due to be back in a few years.
It has actively been campaigning for replacement leases, but to avail.
So bad it is planning its own "rent a seat" all A380 airline.

Pugilistic Animus 25th Jul 2018 22:40

Without cargo ops it seems 4 donks is almost extinct

Cool Guys 26th Jul 2018 02:38

What is so special about an A380 reducing congestion at major hubs? A 787 or A330 will also reduce congestion. If the 737s/A320s are replaced with 787s/A330s the congestion is being reduced. The only situation where this situation is unique to the A380 is if the hub is already full of 777s/A350s.

PAXboy 26th Jul 2018 02:57


Originally Posted by ATC Watcher (Post 10203409)
It never stop to amaze me that we are working in an industry where the client ( the paying pax ) has in fact nothing to say but accept what others decide is best for them. and we are supposed to live in a market oriented global business!

I think there are many industries where this applies. The most obvious is Supermarkets. They always say, "We only offer what our customers want" But I have never had a supermarket ask me what I want - and I'm 61! But I have had supermarkets stop selling things I like and the only explanation they give is that not enough people were buying it. When they replace the item with their own brand look-alike product, one sees the lie.

I do not think that ANY global industry truly listens to it's customers. Look at the tech companies who supply computers, tablets and mobile (cell) phones.
End of rant.

MrDK 26th Jul 2018 03:14


Originally Posted by Cool Guys (Post 10206356)
What is so special about an A380 reducing congestion at major hubs? A 787 or A330 will also reduce congestion. If the 737s/A320s are replaced with 787s/A330s the congestion is being reduced. The only situation where this situation is unique to the A380 is if the hub is already full of 777s/A350s.

Emirates currently has near 50% more 777's than 380's in the fleet
It has near to twice as many 777's on order than it does.380's.
That, to me, paints a picture about fleet expansion, especially since orders for smaller Boeing's (77X/787) outpaced A380 about 9:1 in the past four years.

donpizmeov 26th Jul 2018 04:36


Originally Posted by MrDK (Post 10206372)
Emirates currently has near 50% more 777's than 380's in the fleet
It has near to twice as many 777's on order than it does.380's.
That, to me, paints a picture about fleet expansion, especially since orders for smaller Boeing's (77X/787) outpaced A380 about 9:1 in the past four years.

And nearly 50% of all the 326 77X orders come from EK .Sound similar to the 380 story at all? When the price tag touches over half a billion dollars per unit airlines become a bit shy with their money. 235 of the 326 77X orders come from three companies, being EK, QR and EY. Haven't we seen this before somewhere?

You can get almost 3 787s for the price of one 77X or a 380. The lesser lease/capital cost mean bean counters are able to make far larger bonuses from these smaller aeroplanes. Why would they not want to buy them?

EK operate up to a couple of services a day to MRU, BHX, MAN, LGW, NCE, PRG, VIE with a 380 .A couple of those destinations are with a 2 class aeroplane with over 600 pax seats .So I am thinking the argument stating it can only operate to major hubs is not a valid one.

Volume 26th Jul 2018 06:42


The folding wing design on the 777X is exceptionally simple.
Compared to the design of some aircraft carrier operated military aircraft or some folding wing motorgliders I do not think so.
There are for example 4 individually actuated latch pins, there is a locking mechanism and there is a folding actuator meaning 6 actuators where most landing gears have only two...
And the folding axis is not perpendicular to the wing centerline, making the structure around it extremely complex. (The alternative would have been more air loads during taxi)


In Boeing aircraft "a conventional environmental control arrangement" puts the system in the wing to body fairings OUTside of the fuselage,
It puts the A/C packs in the fairings, the recirc filters, mixers, fans etc. are all between the cargo bay and the center wing box reducing the available cargo volume.


The dreamlifter is mostly non pressurized, so not applicable.
I was more thinking about aerodynamics and weight. Extending the conventional pressurized 747 upper deck all the way back to the tail would have been relatively easy (they partially did it on the -300 EUD and the -400, they could have streched it even further), but would have created the same issues the A380 has (as you correctly identified): lack of cargo space per passenger and lack of cargo weight capacity.
Not talking area ruling and trassonic drag...

procede 26th Jul 2018 09:43


Originally Posted by Volume (Post 10206442)
Compared to the design of some aircraft carrier operated military aircraft or some folding wing motorgliders I do not think so.
There are for example 4 individually actuated latch pins, there is a locking mechanism and there is a folding actuator meaning 6 actuators where most landing gears have only two...
And the folding axis is not perpendicular to the wing centerline, making the structure around it extremely complex. (The alternative would have been more air loads during taxi)

Where the comparison with the 747 flap system goes astray, is that the folding wing folds in the direction of the main force (up) where the track system folds in the direction of the wing cord (and down). The flap system thus needs less safety measures to stop it from extending or retracting due to aerodynamic forces.


Originally Posted by Volume (Post 10206442)
I was more thinking about aerodynamics and weight. Extending the conventional pressurized 747 upper deck all the way back to the tail would have been relatively easy (they partially did it on the -300 EUD and the -400, they could have streched it even further), but would have created the same issues the A380 has (as you correctly identified): lack of cargo space per passenger and lack of cargo weight capacity.
Not talking area ruling and trassonic drag...

KLM stretched the the top deck of their 742 to the length of the 743. This actually ended up reducing overall fuel burn due to lower drag, even though weight was added. https://www.airlinereporter.com/2012...pper-deck-sud/


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