Usually based on weight. You can expect about £85-200/day depending on which airport for a 737/320/757.

Can go up to about £200-400/day for big boys.

Cheaper than express car parking then haha

https://samchui.com/2020/03/26/covid.../#.Xn1g9ohKhPZ

Video at YYZ

LFPG storage 25mar20
 

https://www.dropbox.com/l/scl/AABvZX...zk3-k7xAOXtqJc

EGHH
 

Flitefone: I don't see an image there (poss my PC set up?) so I hope this is not a duplicate post:

https://cimg2.ibsrv.net/gimg/pprune....b915e70838.jpg

"Video showing much of Emirates' fleet now stored at DWC Al Maktoum Airport."


.

The drone footage really captures it.

https://cimg2.ibsrv.net/gimg/pprune....721f06de87.png


Tweet link to video:

Runway 18L-36R at AMS is now also going to be used for parking, adding another 25 places above the 200 they already had.

How long can these aircraft stay on the ground for without the need for servicing before getting airborne again?

They will have continued maintenance checks whilst on the ground.

Usually an into-storage check. 7/14/28 day checks then an exit-storage check. Depending on type obviously. From memory if you get beyond 60 or 90 days then there's more work to be done.

Yesterday, Ryanair flew a circuit with 4 of the aircraft at Luton. Can't see why they should need to do that when others are parking up large numbers for long periods.

Perhaps a new Irish system to store them in the air. Bit of humour sorry.

Also did circuits at Stansted

Major aircraft manufacturers have different AMM procedures for parking aircraft, Airbus have the best workable parking procedures that l have come across.
Airbus you can use parking requirements covering 7, 14 and so on, which you can repeat, these requirements are not classed as storage.
Boeing has always been a pain in the a***, with regards parking an aircraft which you do not want to fly for a few weeks.
It used to be, don't know if it has changed in the last couple of years, that after 7 days parking, all you had left was storage checks.
These checks would take a day or so to carry out, included using a protection compound on all leading edges and also doing so with any control cables.
It would take even longer to take out of storage and it would be very expensive and time consuming procedure.
Sometimes you could get around this by moving the aircraft so that the tyres are rotated and power up the aircraft, use the hydraulics, run systems including the APU and engines.
Ryanair are by the looks of it getting around using storage checks by flying the aircraft and using the parking AMM procedures.

Keeps the staff busy and if get a chance to do a circuit or two then even better.

You do highlight what will become a problem if flights start up quickly as there is not staff available to get things going quickly for every aircraft.

The information on Boeing aligns with what I had heard and seen. In previous years when Ryanair parked up aircraft in the winter, they would always rotate them into service every three days to ensure they were not classed as "stored".
Picking up on Racedo's point, I heard (albeit third hand) that one of Ryanair's challenges when this virus starts to wind down will be recovering their fleet from Italy. Most of those aircraft have been left for some considerable time now and will all require an "A Check" to return them to service. Only a few hours work but logistically will require an engineer to go to each of the aircraft whereas normally, the aircraft would go to an engineering line station for the check.
Hopefully there will be a Boeing engineer along in a moment to confirm or deny that!!

Classed by whom, and according to what accepted criteria ?

DaveReidUK - that I don't know. In my role at the time, we parked up a number of aircraft for FR during the winter when not required. From my recollections, no aircraft was left idle for longer than three days and the handlers / line engineers suggested this was the reason.
I imagine there would be something in the Boeing manuals somewhere which makes this the case but I couldn't quote you a reference. It is why I suggested that if a Boeing engineer was lurking on the forum, they might be able to provide some clarity.