Firstly it looks like your panning is pretty good so well done on that.
I like no.2 the most, it's uncluttered and all about the plane with the blur of the clouds giving the perception of its speed.
I also like the spitfire (no.4) although it would be nice not to have the assorted ground-based bits in the frame, although this does give the sense of distance to the ground if that's what you're trying to portray.
Not so keen on no.3, just seems a bit dark and due to its enormity it's partcularly hard to get the whole thing in the frame and the loss of the wings and engines means it just doesn't feel right to me.
Hope some of that helps, looks like it was a good show - must get myself to one of these sometime.