HEADING - Direction on a compass that aircraft is pointed, measured with respect to true north or magnetic north.
HELICOPTER - A rotorcraft that, for its horizontal motion, depends principally on its engine-driven rotors.
HELIPORT - an area of land, water, or structure used or intended to be used for the landing and takeoff of helicopters.
HORSEPOWER - The motive energy required to raise 550 lbs. one foot in one second with no friction.
HYPERSONIC - Speed of flight at or greater than Mach 5.0, exceeding supersonic.
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