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Alternative clues for the word sst

• Its business is booming
• Certain retired craft, briefly
• Swift Atl. plane
• Old jet-set jet
• Controversial aircraft
• Boomer that retired in the early '00s?
• Sound barrier breaker: Abbr.
• Mach 2 flier, for short
• Bygone travel option, informally
• Former jet-set jet