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3. Former rapid transit: Abbr

Alternative clues for the word sst

• What the fast jet called the Concorde was: Abbr
• Former fast jet, in brief
• High-speed inits
• Air France plane, once
• Onetime barrier buster
• Grounded fast flier
• Bygone air inits.
• Boomer that no longer booms, briefly
• Barrier breaker, for short
• Streak in the sky, for short