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3. Speedy air freighter

Alternative clues for the word sst

• Historic aircraft inits
• Bygone travel option, informally
• Unrealized 60's Boeing project
• Craft that once landed at Heathrow
• One-time stratospheric streaker
• Pond-crossing option, once
• France'sConcorde, for one
• Attraction at Boeing's Museum of Flight, for short
• High-speed inits
• 1980s hardcore label