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3. Very fast plane

Alternative clues for the word sst

• Streaker to Heathrow
• Certain plane: Abbr
• Speedy way to get to Paris
• In-development Aerion AS2
• Mach 1 passer
• Fast transport: abbr
• Plane with a machmeter: Abbr.
• Old fast plane: Abbr
• Airport sight
• JFK jet, formerly