Thanks everyone for the comments.
Originally posted by MikeW One thing though, although most of the images are very sharp, I found the "stopped" propellers on some of them to be odd looking (e.g., the DC3/C47). Having never shot an airshow I don't know the answer, but is it possible to get acceptable sharpness of the airplane with a slower shutter speed and still retain a sense of motion on the propeller?
Looking through the folder, anywhere between 250th and 800th of a second seems to give the propellers a slightly blurred effect.. so i guess that and some practice with panning would work.
I'll try shutter priority next time and maybe a polarizer?
This shot of B25's was at 1/400th