I think 400mm minimum for airshow photography. I used 80-400VR for a few years and I realise it not on your list but beware of cheap lenses. When on a budget used is always worth considering but be patient for the right lens at the right price.
A zoom is recommended for airshows as the subject will vary enormously in size and distance throughout any show.
70-300ED focus speed, sharpness and CA were all issues for me.
Sample 80-400VR, focal length approx 350mm
http://www.worldphotographyforum.com...o=2469&cat=504