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A hellocoptor
On an airplane.
Of course airplane heights are safer than mountain heights. Mountain heights are extremely dangerous and really scary but airplane heights are more higher altitudes. Airplane heights are not that scary also it is much safer than mountain heights.
360 km/h
there is no difference
Spelt airplane wrong. And its any WWII fighter aircraft.
A hellocoptor
If by "friendliest", you mean most comfortable, the Boeing 747 in its Upper Deck Lounge configuration has the widest aisles, most leg room, and most comfortable seating. First class in a 747 is the equal or better of any existing passenger aircraft.
C57 H104 O6 Triolein
the airplane with the most fuel
The noun form is friendliness (for friendly, friendlier, or friendliest).
He was the friendliest, jolliest mailman we'd ever had.
A dog is the most friendliest pet
a kind of airplane
Depends on the kind of airplane.
The African country that is the friendliest towards Americans is Liberia.
The kind that flies.