Many thanks Jur for your help, it was fantastic and I feel that my colour correcton has improved vastly! However, I was just wondering whether you could tell me what you think is wrong with the colour in these rejections:

Wannabe pilot,

I’m glad to have been of help to you. Your photo’s seem quite alright to me, although some adjustments could still be made. However that’s largely a matter of taste.

In general, with the exception of HZ-AKF, I find most of your pictures a little bit too red/magenta, even bearing in mind that it was approaching sunset.

G-ZAPV, D-AKNM and EI-OZB seem to me to be a bit too tightly cropped. More air (especially) in front and behind the aircraft would make a more pleasing composition. Again, this is also a matter of taste of course.

D-AKNM and EI-OZB suffer a little bit from blown-out highlights (especially below the windows and the fin). I’ve tried to correct that a bit, but it is impossible to regain detail when a part is really overexposed.

I don’t know whether you took this pictures in RAW or in JPEG. If at all posibble I would always select RAW, as this provides you with the best correction options (especially white balance, contrast, exposure) in postprocessing.

Did you use auto white balance or did you select a pre-set WB? The quality of auto WB differs from camera model to camera model. Also the WB could change from picture to picture. I would recommend to use a pre-set option like sunny daylight, which will virtually give you the same results as when using daylight slide film. Any required change in WB in postprocessing could be applied to all photo’s taken under the same circumstances.
Another option is to measure the white balance with the camera or to take a test picture of a suitable gray card (e.g. WhiBal) in the same light as your subjects.

In postprocessing it is also important to have your monitor calibrated. Affordable options are Color Vision Spyder 2 and Monaco OPTIX.

Hope this helps.