On the subject of flying a B-17 through a hangar, better first spawn from a bomber hangar whose doors are open wide enough for the wings to pass through.
Tonight I spawned a B-17 in a hangar, went to F4 and watched the wingtips pass through the hangar walls. That doesn't work in reverse, however. When I taxied back into the hangar, the wingtips tore off.
I spawned there again, observed the wingtips passing through the doors again, then taxied across the field to another hangar whose doors were open enough (barely) to let the B-17 taxi through it.
Go figure.