You cannot get a B777 (which American has plenty of) into the hanger with that center door there! There is not enough opening to do this! If that is the way it is to remain, then I will have to live with it!
That's not a center door: it's a center column which the other doors fold unto it. In any case, the left side of the hangar can fit a 747, as you can see the screenshot, so you can just put a 777 on that side.