Originally Posted by
sinsilvia666
Also on most jets, just happened we saw on a 757, what is the door that opens just under the captains side rear elevator, is it a back up air vent for the APU? I am pretty sure the one on the FOs side above the elevator is.
Possibly they are the outflow valve (lower left aft side of the fuselage) and the APU intake (upper right extreme aft)