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3. Barrier-breaking jet

Alternative clues for the word sst

• Retiree of 2003, briefly
• Fast one, for short
• Fleet flier
• Mach 2 plane
• Former Air France flier
• Controversial plane: Abbr
• Jet last flown in 2003
• JFK flier
• Unrealized 60's Boeing project
• Mach 1 breaker, once