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3. Old boom-creating speedster, briefly

Alternative clues for the word sst

• Super airliner
• Atl. speedster
• Once-and-future Mach 2 flier
• Minutemen label
• Retired jet (abbr.)
• Historic barrier breaker
• Orly speed demon
• Concorde, for example
• Former fast flier across the Atl
• Kennedy visitor