Hi all, I flew from LIS to LHR yesterday (BA 501) and I noticed for the first time a small, open 'hatch/door' just underneath the very last rear door on A320's and 19's, I saw 6 aircraft taxiing to the runway with these open. Im quite knowlegeable on aircraft but I must admit I have no idea what these are, can someone answer this?
I apologise in advance if this is achingly obvious.
Thanks!
