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3. High fliers under a cloud

Alternative clues for the word ssts

• Tu-144 and others
• Former sonic boom producers
• Concordes, familiarly
• Former Mach 2 craft
• Fast fliers of the past: Abbr
• Rapid transports
• Orly birds, once
• Sonic jets of yore (abbr.)
• Tupolevs, e.g.
• Mach-makers: Abbr.