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3. Unrealized 60's Boeing project

Alternative clues for the word sst

• Old boomer
• Onetime fleet member
• It went boom, for short
• Speedy jet (Abbr.)
• Grounded speedster
• Booming jet of old, briefly
• Descriptive aircraft letters
• Retired jet: Abbr
• Really fast plane, for short
• 747 alternative, once