I'm afraid the first one won't make it, the pole infront of the plane will get it rejected and its not centered left to right, it is not level with the ground. And part of the fuselodge is washed out, meaning you cant see the details, and I'm afraid the quality is far under what is accepted.
Although I like the Sun Country pic. Its not up to quality, and I'm not sure if the black and white is helping. The aircraft is not centered. It is also suffering from distance, the airaft is not close enough.
The 744 shot is good but again quality isn't there. And part of the wing is clipped out.
The 757 shot is blurred and the quality isn't there.
Don't let this put you down, you're off to a great start, but with some practice you could have some amazing shots. Firts off, lets start by cenetering the aircaft in the frame. We'll work from there. Make sure the aircraft is centered and the plane is close in the frame. Next time we might have a little more to work with, also, if you can go out when the sky is blue, it will improve your photos alot. Remember to have the sun behind you so the plane is not "backlit".
You'll do great on A.net with some more practice.
Lighten up while you still can, don't even try to understand, just find a place to make your stand and take it easy