How's things? The KLM MD11 looks like it could do with just a little increase in contrast, but it doesn't look far off on my screeen. There's a little noise and it could do with a bit more sharpening so I tend to agree with the rejection reasons. Same with the 747 really. It looks like you were taking them late in the day and there wasn't much light, it's always going to be difficult under these circumstances. With a bit of noise reduction and a careful edit, you might be able to bring them up to the standard needed for here, but I don't think it'll be easy with them.
Equipment: 2x Canon EOS 50D; Sigma 10-20 EX DC HSM, 50-500 EX APO DG, Canon 24-105 f/4 L, Speedlite 430EX