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3. Once-and-future Mach 2 flier

Alternative clues for the word sst

• Former barrier breaker
• Retired cruiser
• Bygone boom producer, briefly
• Aircraft with an ogival delta wing: Abbr
• Sleek flier
• Fast transport: abbr
• The Minutemen's record label
• One of a fleet fleet
• NASA low-noise prototype in development
• Old boomer