Next to the quality, I personally find it difficult to get shots accepted that show only (say) half of an aircraft. It seems to me the preference is for close-ups, or full aircraft fuselages (wings may be cropped under some angles), but not half planes, although I personally find these shots quite nice.
I do believe some of these pics have potential though, with just some extra tweaking perhaps. Drop me a line through the contact info in my profile if you want me to give it a try? Especially the first Easyjet and the SN
could be good candidates, as I really only see some noise in the sky at first sight.
Good luck anyway!