Nice one, look forward to seeing more!
I've yet to try taking any pictures of flying aircraft with my DSLR, but I'm guessing you need a fairly decent lens to get any clear shots.
Glad I mentioned Lionel Charlet now. Having done a bit of Googlising to try and find out what has happened to his site I've just discovered he released another DVD at the very end of last year. Need to find someone who'll sell it to me and ship it over now!