They are a little un-even,that is about all I could fault on the first two pics.Try to level them out. They are excellent pics,sharp and colorful. The screeners may not like all the ramp lice on the first pic. As far as I'm concerned, that adds to the pic. The third pic has some kind of roof edging or something that interferes with the pic at the bottom, I can't see them taking it period. Good luck with your re-uploads.
Your shots look good as far as the technical side goes. They are pretty sharp and clear. But....The composition leaves much to be desired. If you go through the databaste you will find very few photos of planes at the gate with all the lice around them. Nothing in your photos says, "look at the airplane!"
Work on that composition and you will have some real winners I think. Good luck
I think you should try other kind of photos. As said before, gate photos and ramp lice don't have good acceptance here and another thing against you is that you cutted the wings. You must choose between a close up to the fuselage or the entire plane including the wings. By cutting the wing tips as you did the photos are ruined.
Don't the screeners have a specific message about your shot not being level? Seems like you are guessing why they were rejected, when you have some idea from their rejection message.
On the subject of level photos. All three of your photos are level. There is a bit of a problem on this site with screeners rejecting photos because they feel they are not level, when in fact they are level. I have seen all kinds of crazy suggestions such as "make the taxiway level even if it is not in real life." This is nonsense. The screeners should judge the picture by looking at the sides of the frame and comparing this to vertical structures in the picture such as buildings and light poles. When these things are not present in the view, the screeners do not know what is level and what is not, and should not be rejecting a photo because they feel intuitively that it is not level. I had a perfectly level, operational A-3 Skywarrier shot rejected a few months ago for not being level, when in fact it was level. What bugs me is there are only one or two of these aircraft in the database.
And one more thing - maybe crop so that bottom right corner structure is out of the picture. It's a pretty good shot - shows the athmosphere of an airport on a moody day. Keep up the good work young man !!