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3. Plane with a machmeter: Abbr

Alternative clues for the word sst

• Former fleet member
• Jet-setter's jet, once
• Tupolev Tu-144, for short
• Former JFK boomer
• J.F.K. regular
• Concorde, e.g., briefly
• European streaker
• Fast plane: Abbr.
• Big fast jet
• Jet to Heathrow