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3. Once-and-future Mach 2 flier

Alternative clues for the word sst

• NASA low-noise prototype in development
• Fast flyer, for short
• Retired flier since 2003
• Old sound barrier breaker, briefly
• Orly flier, once
• Onetime barrier buster
• Orly-Dulles transp.
• Former Atl. traverser
• Retired jet, for short
• Jet to LAX, once