21.   Sanders is responsible for the electronic guts of the advanced tactical fighter, which is designed to evade radar and fly at supersonic speeds.

22.   Supersonic speed.

23.   Supersonic speed has remained a formidable barrier for most airlines, and no successor to Concorde is within sight.

24.   The clincher for Lockheed Martin was its novel design of the JSF version that can hover as well as fly at supersonic speeds.

25.   The Concorde uses its fuel to run the engines and to conduct heat away from the wings, which heat up at supersonic speeds.

26.   The FAA limits aircraft flying at supersonic speeds, but has no restrictions on afterburners.

27.   The fighter can hover over the battlefield as well as fly at supersonic speeds.

28.   The forces at play when a car goes from subsonic to supersonic speeds are difficult to simulate in wind tunnels or with computer projections, experts say.

29.   The heat-seeking missile is designed to travel underwater at supersonic speeds and evade radar, according to defense analysts.

30.   The heat-seeking missile is designed to travel underwater at supersonic speeds and evade radar.