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3. Mach 1 beater

Alternative clues for the word sst

• Fast plane: Abbr
• Tupolev-144, e.g
• Plane seen at the Museum of Flight outside Seattle
• Mach 2 flier, for short
• Mach 1 flier
• Bygone jet, briefly
• Ultrafast jet, for short
• Former barrier breaker
• Retired transport
• 2003 retiree, briefly