| Answer | Crossword Clue |
|---|---|
| SSTS | Grounded faster-than-sound airplanes |
| SUPERSONIC | Faster than sound. |
| SUPERSONIC | Faster than sound |
| YEAGER | First person to travel faster than sound |
| CHUCKYEAGER | First pilot to travel faster than the speed of sound |
| YEAGER | First pilot to fly faster than the speed of sound |
