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3. Old sound barrier breaker, briefly

Alternative clues for the word sst

• A fast one
• Boom Technology product-to-be
• Atlantic crosser, once
• Speedy air freighter
• Visitor to J.F.K
• Former Mach 2 flier: Abbr
• Black Flag label
• Certain descriptive aircraft letters
• Ret. jet
• Tilt-nose jet