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3. Fast flyer to J.F.K., once

Alternative clues for the word sst

• NASA low-noise prototype in development
• Option for the jet set
• Boomer for 35 years
• Retired flier: Abbr
• Air France fleet member
• Quick traveler across the Atl., once
• One-time stratospheric streaker
• Flier with delta wings
• Craft that last flew in 2003: abbr
• In-development Aerion AS2