If you're shooting just to get photos on a.net or jp.net, you're wasting your time anyway. Shoot for yourself, and if you get photos accepted, all the better. That's what I do.
That said, checking the photos accepted to those sites can help you become a better photographer, and get more photos accepted. I may be unusual (well, I know I am, but that's another discussion) but I got my first upload to jp.net accepted. Since then, there have been lots of uploads, and lots of rejections along the way. For the longest time, I didn't upload to a.net because of some of the rejections I got, but I'm giving it a try again, with good results so far.
Looking at your photos, the JetBlue shot is overexposed - that's a common problem with those jets, I do it myself, and looking at the line between the white fuselage and blue belly, you can easily see the heat haze issue. Your Avianca 762 looks OK to me, but then I find I usually need a touch more USM for uploads then I think absolutely necessary. On the Allegiant shot, the heat distortion is clearly seen on the starboard wing (right side of photo). The Spirit shot looks pretty good to me, but again, I see a little heat distortion.
As I said, if you don't want to upload to jp.net or a.net, don't. Shoot for yourself. For me, this hobby isn't about uploads or hits, but about the people I've gotten to know and the things I've experienced along the way. But please, use the feedback from your rejections (or from posting here on NYCA) to help you become a better photographer. We all have something to learn!
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