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3. Former flier, for short

Alternative clues for the word sst

• Stratosphere streaker, once
• JFK sight until 2003
• Erstwhile rapid transit
• Former barrier breaker
• Jet to JFK, once
• In-development Aerion AS2
• Old jet set jet, briefly
• Influential hardcore label of the '80s
• Old jet-set jet
• Quick traveler across the Atl., once