[sjwright]

Or fuel in the tank.

And it’s probably being blocked in by other planes. Those desert boneyards don’t park planes with random access in mind.

[quickthrowman]

Looks like they leave fuel in the tank if it’s for short term storage, but they drain various fluids if it’s longer term storage. Probably depends on the circumstances.

[sjwright]

Precisely—and this circumstance is retirement with no prospect of a quick sale.

At a guess, they’ll probably have limited parts value, only that which would be valuable to operators of 747 freighters. Mainly the engines, if they’re in good nick.