Helicopter:
BELL 412
reason for this is just the sound of those 4 rotor blades slapping the air plus u can hear them from a mile away.
Commercial:
BOEING 747-400 reason being is that when the rotate the look so good climbing away from the runway.
Fighter:
F/A 18 HORNET just due to fact that the are such good fighter planes in the way that they can turn so sharply etc
