Yes, but I think the whole "Plane crashes, other guy wins!" deal is getting overused lately. IE, Roguebeaver's RFK TL used it not long ago, and I think I recall it at least one other place.
I used the Airplane crash scenario, in my very short lived POTUS Lloyd Bentsen Timeline a while back. Basically I had the Dukakis family and the major campaign heads die in plane crash right on route to the second debate. Public sympathy for the tradgedy plus the Bush campaign not being able to effectivley attack the more Presdential Bentsen, won a narrow victory. I don't really see why a crash is necessary for this timeline, seems like to me Rocky should be able to win the '76 election hands down.