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3. Retd. speedster

Alternative clues for the word sst

• Boom maker, once
• Aircraft in the Smithsonian Inst. collection
• Plane that no longer flies
• Mach 1 flier
• JFK flier
• Delta-winged craft
• Old JFK jet
• Its last flight was Nov. 26, 2003
• Erstwhile rapid transit
• Bird that no longer flies