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3. Old JFK flyer

Alternative clues for the word sst

• Bird that no longer flies
• Mach-1 surpasser
• Jet to JFK, once
• Grounded speedster
• TU 144, for one
• Transatlantic cruiser
• Out-of-service plane
• Decommissioned flier
• Old sound barrier breaker, briefly
• The Concorde was one