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Alternative clues for the word sst

• Big fast air freighter (acronym)
• TU-144, e.g
• "Bird" with a flexible nose
• Retired flier: Abbr
• Ret. boomer
• One-time stratospheric streaker
• Stratosphere streaker, once
• Intrepid Sea, Air & Space Museum exhibit, for short
• Grounded plane: Abbr
• Concorde, e.g., for short