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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Mach 1 breaker, once:

SST: Mach 1 breaker
SST: Mach 1 breaker, once
SST: Retired mach 1 breaker
SST: Bygone Mach 1 breaker, for short
SST: Bygone Mach 1 breaker, in brief
SST: Mach 1 breaker, briefly
SSTS: Mach 1 breakers