Allright: Step by step:
^Badmotive, although interesting to you, its not interesting in an Airplane database
^Same goes here. Allthough it technically has everything it should have (part of airplane in sight) it is not an interesting view. No extraordinary cloud formations or airports etc
^Too focused. People are not interested in 1 seat, they want to see the entire cabin
^Could try this, but again, a composition which includes more of the entire cabin would be better
, its an airport overview, but it is not a spectacular hall or terminal, its just a walkway. Plus it has recognisable people in it, causing a Badpeople rejection
^Too much ramplice. Ground equipment block out parts of the aircraft. The front gear for instance
^Nice cockpit view, you could try uploading this one. It would have been better if you could have taken a step to the right, the back of the captains chair is not very interesting
^This one is pretty good. Clear view of the aircraft as it sits at the gate. No obvious ramplice moving around.
^It must have looked really nice in-flight, but for A.net it is not interesting and big enough. Should have used more zoom.
Anyhow, good luck, I think you can safely upload the 777 at the gate. (the 3/4 one)