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3. Scrapped Boeing project, briefly

Alternative clues for the word sst

• Overkill L.A. label
• Retired boomer, for short
• Former fast plane: Abbr
• Retired jet, briefly
• Its business is booming
• Bygone fast flier, briefly
• Retired speedster
• It went boom, for short
• Former flier, for short
• Retired flier, for short