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3. Ret. fliers

Alternative clues for the word ssts

• Mach 1 toppers
• Boom Technology products on order for NASA
• J.F.K. landers until 2003
• Former high fliers
• Phased-out jets
• The Concorde fleet, e.g. (abbr.)
• Retired speedsters, briefly
• TU 144's
• Retired streakers, briefly
• Old fliers: Abbr