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3. Former shock wave creator

Alternative clues for the word sst

• Retired boomer, briefly
• Concorde, notably: Abbr
• Bygone boomer
• Jet-set transport
• Old fast plane: Abbr
• Cruiser at 1,350 mph
• Fast flyer to JFK
• Very fast airplane
• Concorde's letters
• Atl. crosser, once