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3. Grounded flier, briefly

Alternative clues for the word sst

• Aviation introduction of 1968
• Mach topper
• It's been out of commission since 2003 (abbr.)
• Old JFK flyer
• Contemporary aircraft
• Retired airplane
• What the fast jet called the Concorde was: Abbr
• Barrier-breaking craft, briefly
• Former fast jet, for short
• Boomer that no longer booms