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3. Onetime sonic boom maker

Alternative clues for the word sst

• Streak in the sky, for short
• Grounded fast jet, briefly
• Contrail source, once: Abbr
• Bygone plane
• June '03 Smithsonian acquisition
• Old booming jet, briefly
• High-flying retiree of 2003 (abbr.)
• Retired JFK jet
• Aerospatiale product
• 747 alternative, once