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3. Retired airplane

Alternative clues for the word sst

• Atl. crosser until 2003
• It's not breaking the sound barrier anymore
• Former Air France jet
• Canceled Boeing boomer
• Historic barrier breaker, for short
• Focus of a July 2000 crash investigation
• Onetime JFK jet
• TU 144, for one
• Orly flier, once
• Jet set's jet