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3. Old JFK jet

Alternative clues for the word sst

• Old sound barrier breaker, briefly
• Concorde, for one: Abbr
• Mothballed flier
• Jet for the jet set
• Label for Opal and Hüsker Dü
• Fast plane: Abbr
• Retired mach 1 breaker
• Sidelined ocean crosser
• Flightless bird?
• The Minutemen's record label