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3. One with delta wings, briefly

Alternative clues for the word sst

• TU 144, for one
• Bygone boom producer, briefly
• Craft that must overcome wave drag, in brief
• Fast way to the U.K., once
• Former Atl. crosser
• Canceled Boeing boomer
• Attraction at Boeing's Museum of Flight, for short
• Onetime barrier buster
• Bygone barrier-breaker
• Erstwhile rapid transit