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3. Mach 1 breaker, briefly

Alternative clues for the word sst

• "Bird" with a flexible nose
• International streaker
• Contrail source, once: Abbr
• Expensive transport
• Former high flier
• It's not breaking the sound barrier anymore
• Speedy jet to J.F.K
• Boom source
• Fast plane: Abbr.
• Former Heathrow lander