As you may know, AIRPLANE! is actually a scene-for-scene remake of the 1957 film ZERO HOUR (just released on DVD), with the original plot and much of the original dialogue played for laughs. Here is a comparison of some bits from the original and their equivalents in AIRPLANE! (this is only a partial selection, of course).
I didn’t know that.
I too did not know that, and it adds a whole new hilarity to the already infamous Airplane! From where did you steal this?