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3. Onetime flier

Alternative clues for the word sst

• Swift jet
• Mach topper
• Once-and-future Mach 2 flier
• Former jet to JFK
• Former shock wave creator
• Former fast jet, in brief
• Old aviation inits
• Aviation introduction of 1968
• Brit. Airways retiree
• Former flier to J.F.K.