I laughed my ass off (not literally) at this thread! It highlights lots of good points, despite the bickering. The gear down, flaps 20 one is interesting, as the books DO state that that's the order to do things.
Regarding "fly's," I think it has to do with Toss Parker's age. It seems that the education system (of lack of it) has encouraged (or rather not DIScouraged) people to pluralize words with an apostrophe rather than an "s" or "es."
Toss must be a youngster or just as illiterate as those people who put the letters on the street signs at gas stations, hardware stores and fast-food joints.