Hey there Dimitry....... misery loves company.
Got a few rejections myself this week and also for the same badquality. Shot DIGITAL and they say to re-scan it due to poor scan quality. Jeezzzes, not sure where to go myself. Sometimes a full frame 2MP image is accepted, and sometime it is rejected for poor quality. Same camera, same resolution. Go figure.
As to yours.
Beech shot does nothing for me. Don't like the shadow on the tail which detracts, also the building in the back seems to dominate the frame visually.
Fedex I would rotate about 1 degree or 1.2 degrees CW.
Alaska. Looks great after I clone the light pole out of the frame. Of course we KNOW that is not allowed,
You could also try a chainsaw late one night..... remove the pole that way.
UPS and Atlas. They images seem flat to me. I took a look at the levels in Photoshop and think you could do some work there. The photos are a bit flat and grey looking. Also check the color cast in them. Have you run the A.net monitor calibration program? Good to keep checking periodically.
There's some grain in the photos. What film speed were you using? Or perhaps you oversharpened it a bit much which can also accentuate the grain. One thing I tried was to mask select the sky then gausian blurr it to hide the grain. Feather the edges of the mask so it blends nicely. Makes the grainy look disappear. It's not as noticeable on the aircraft, and you can't blurr that out.
But both are nice photos. Nice location you have. Love that background with the mountains.
Anyway. Wish the UPS and Atlas had been accepted. Oh well....... keep shooting.