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3. Downed plane of 1971

Alternative clues for the word sst

• Plane with a machmeter: Abbr.
• JFK jet, formerly
• One of a fleet fleet
• Contrail source, once: Abbr
• Grounded commercial flier
• Super plane
• Onetime JFK jet
• Droop-nose jet (Abbr.)
• Concorde jet
• Mach-1 surpasser