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3. TU 144, for one

Alternative clues for the word sst

• Retired barrier breaker, for short
• Ex-Atl. crosser
• Very fast airplane
• Fast jet retired in '03
• Atl. speedster
• JFK lander until 2003
• Onetime sonic boom maker
• Former JFK lander
• Unrealized 60's Boeing project
• Tupolev-144, e.g