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3. Bygone fleet member

Alternative clues for the word sst

• Concorde jet
• Former fast jet, in brief
• Boomer that retired in the early '00s?
• Past cause of a boom
• Jet that set in 2003
• Post-Katrina Prince song
• It's not breaking the sound barrier anymore
• Wings of a sort
• Mach 2 plane
• Aviation introduction of 1968