Webster has this to say:

One entry found for airplane.
Main Entry: air·plane
Pronunciation: 'ar-"plAn, 'er-
Function: noun
Etymology: alteration of aeroplane
: a powered heavier-than-air aircraft that has fixed wings from which it derives most of its lift

Notice the heavier than air part.

When a plane is hovering, it is no longer flying like a airplane anymore, therefor the hard fast rules that apply for airplanes would not apply anymore.
Of course. If this is what you are trying to say, then I agree.