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3. Boeing craft

Alternative clues for the word sst

• Flightless bird, nowadays?
• In-development Aerion AS2
• Former plane in the stratosphere
• Quick traveler across the Atl., once
• "Bird" with a flexible nose
• 2003 retiree, briefly
• Runway retiree of '03
• Onetime JFK sight
• Fleet flier
• Jet set's pet plane