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3. Grounded boomer

Alternative clues for the word sst

• Former flyer
• Old Brit. Airways jet
• Fast plane: Abbr.
• Old J.F.K. sight
• Retired Mach 2 breaker
• Defunct flier
• Lander at J.F.K., once
• Former JFK plane
• Boom source
• It's been out of commission since 2003 (abbr.)