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3. TU 144, for one

Alternative clues for the word sst

• Black Flag label
• It's not breaking the sound barrier anymore
• Retired airplane: Abbr
• Onetime sonic boom maker
• Greg Ginn's label
• Transatlantic flier, for short
• Former flier, briefly
• Inactive transporter, briefly
• It has an adjustable nose
• Plane seen at the Museum of Flight outside Seattle