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3. One-time stratospheric streaker

Alternative clues for the word sst

• Once-and-future Mach 2 flier
• Focus of a July 2000 crash investigation
• Bygone British Airways plane, briefly
• Delta wing craft
• Speedy air freighter
• Retired speedster
• Fast way to JFK, once
• It first arrived in DC in '76
• Ex-ocean crosser
• Orly-Dulles transp