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3. Mach 2 breaker

Alternative clues for the word sst

• Booming jet of old, briefly
• JFK lander, once
• PDQ plane
• Craft that once landed at Heathrow
• Rapid transit
• Boeing craft
• Concorde, for one: Abbr
• In-development Aerion AS2
• Jet that last flew in 2003
• Retired jet, briefly