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3. Boomer that no longer booms, briefly

Alternative clues for the word sst

• Jet to JFK, once
• Its last flight was Nov. 26, 2003
• Former JFK plane
• It's not breaking the sound barrier anymore
• Former shock wave creator
• Contrail source, once: Abbr
• Grounded flier, briefly
• Tupolev Tu-144, e.g
• 2005 Prince song
• Retired fast plane: Abbr