F1 driver Eddie Irvine - helis.
George Kennedy (a.k.a. Joe Patroni of the Airport movies).
James Doohan (Scotty).
I'm sure I saw a newsclip years ago of Ian Botham taking some lessons.
Christopher Reeve when he wasn't using his superpowers.
Not so sure about this one but I think Larry Olivier learned to fly to try to get into the RAF during WW2?