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3. Mach-1 surpasser

Alternative clues for the word sst

• Option for the jet set
• The Concorde, for one (abbr.)
• Tupolev Tu-144, e.g
• Fast jet of old
• Atl. flier
• Onetime sonic boom maker
• Bygone plane
• Unrealized 60's Boeing project
• Mach 1 beater
• Orly bird, once?