seen this before...
I use to be based at Prestwick many years ago.
They often had the odd old B747 parked there for long periods for internal cleaning.
These B747 in question had BEEN used for the Hajj or the other "mass movement to the middle east" religious festival(s). In my recollection non had any commercial markings other than the minimum legal. Just all white ['ish].
They were often there for months. We were all very curious as to why these expensive "NOT flying in revenue service" hulls were stuck there.
We were told:
chartered by "middle eastern" customer for these events;
all pax seats had been removed, i.e. they have no seats inside passenger cabin;
all pax sat on the floor;
they are filled to the max of the floor space;
grossly overloaded in NUMBERS of pax, but not the mass [weight];
pax had to bring own food and drink for flight;
some pax brought portable "stoves" !;
toilets were insufficient for pax numbers - therefore pax did their "thing" in and around the cabin;
A/C were stuck for long periods every year until cleaners could be found who were prepapred to accept this "cleaning" task!
Imagine the internal atmosphere. the door were rarely opened due to OUR H&S laws.
Hence i am not suprized at the pax numbers at the top of this thread.