| Answer | Crossword Clue |
|---|---|
| SSTS | Mach I breakers |
| SSTS | Former Mach I breakers, for short |
| SSTS | Mach-2 breakers |
| SSTS | Mach 2 breakers |
| SSTS | Mach 1 breakers |
| SST | Mach I breaker |
| SST | Mach I-breaking plane |
| CONCORDE | Retired Mach I breaker |
| YEAGER | First Mach I breaker |
| SST | Old Mach I topper |
