Yes, I forgot to say earlier, excellent editing Rob. You really have bought out the best in the pics. How did you make the adjustments and get the images sharper?
Layers, lots of layers and masking, I usually use unsharp mask to sharpen then mask again to only sharpen what needs sharpening. Some processes are done globally, some are more selective.
At present my process would be levels, saturation, mask off the aircraft, surface blur the sky a little (to reduce any noise), dodge and burn the aircraft if needed, duplicate & sharpen, alter opacity to suit change sharpened layer style to luminosity to reduce any induced colour noise. STOP, do something else for 5 minutes, have another look with "fresh eyes" make any final adjustments, done.
Even the above is somewhat simplified, but I think I spent about 10 minutes on each pic, have them all loaded in tabs, so I work on the first til its "done" then I work on the next til "done" then I go back and check them against each other and I always make sure I have the original as the background untouched to really compare before and after.
My processing changes day to day as I learn new techniques and better ways of doing things. I practice alot...haha.