11.   All three will be capable of flying at supersonic speeds.

12.   But approaching or reaching supersonic speeds presents a new set of aerodynamic problems that raise risks in areas that are unknown.

13.   Flying at supersonic speeds puts a huge strain on human pilots, the equivalent of the pressure of multiple Earth gravities.

14.   Hall said the plane did not reach supersonic speed in its initial dive, as some specialists had speculated.

15.   In a scramjet, air enters the jet turbine at supersonic speeds, eliminating temperature buildup and enabling the engine to produce more thrust.

16.   It will be able to reach supersonic speeds without using after burners.

17.   Its solid fuel rocket motor propels it to supersonic speeds.

18.   Neither military nor civilian jets operate at supersonic speeds over the continental United States, because the accompanying sonic boom rattles doors and can break windows.

19.   Nothing from the recorder so far indicates that a thrust reverser was erroneously deployed or that the aircraft reached supersonic speed as some experts had speculated, Hall said.

20.   On Tuesday, investigators said the EgyptAir jet plunged from the sky so quickly, it reached a supersonic speed before it hit the water.