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3. 747 alternative, once

Alternative clues for the word sst

• Quick traveler across the Atl., once
• It was built for speed
• J.F.K. lander
• Contrail source, once: Abbr
• Record label that shares its name with a fast airplane
• Brit. Airways retiree
• Fast flier, formerly (abbr.)
• Former Mach 2 flier: Abbr
• Mach-1 surpasser
• The Concorde, e.g.