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3. Retired plane

Alternative clues for the word sst

• Contrail source, once: Abbr.
• Retired Mach 2 breaker
• U.S.S.R.'s Tu-144, e.g
• Former boomer
• Delta-winged craft
• Former boomer, briefly
• Record label not named after a plane
• Onetime Negativland label
• Mach 1 breaker, briefly
• Jet Set jet, once