1951

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NACA Lewis Laboratory completed first rocket combustion tests using the high-energy propellant liquid fluorine as an oxidant.

Production of J-65 Sapphire turbojet engine begun by Curtiss Wright, later fitted in some instances with afterburner in F-84F. B-57, FJ-3, F11F-1, and A4D-1.

USAF initiated development of liquid-propellant rocket engine with thrust of 150,000 pounds (XLR 43- NA-3).

NACA's A. Scott Crossfield first flew a series of aerodynamic parabolas to produce a short period of weightlessness, In a YF-84 at Edwards AFB. Calif. Maj. Charles E. Yeager (USAF) also flew some of these so-called "Keplerian trajectories."

Air passenger-miles (10,679,281,000) exceeded total passenger-miles traveled in Pullman cars (10,224,714,000), the first time in U.S. history.