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Alternative clues for the word sst

• Boom Technology product-to-be
• Former fleet member
• Fast way to the U.K., once
• Concorde or Tupolev
• Mach 2 flyer of the past
• Descriptive aircraft letters
• Boeing 2707, e.g
• The Concorde, for short
• Ultrafast plane, once
• Fast flyer to JFK