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3. Speedy airplane

Alternative clues for the word sst

• Sound-barrier breaker of yore
• Old ultrafast plane, briefly
• Mach 2 craft
• Plane with a tipped nose
• Atlantic crosser of old
• The U.S.S.R. had the first civilian one
• Air France fleet component, once
• Erstwhile rapid transit
• Scrapped Boeing project, briefly
• Tupolev Tu-144, for short