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3. Onetime Heathrow sight: Abbr.

Alternative clues for the word sst

• Aviation introduction of 1968
• One-time JFK lander
• Mach 2 flyer of the past
• Jet last flown in 2003
• European streaker, once, in brief
• Fast plane that's on exhibit at NYC's Intrepid Museum
• Former U.K.-to-U.S. flier
• See 37-Across
• Passé flier
• Concorde or Tupolev