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3. Retired flier: Abbr

Alternative clues for the word sst

• Strike Anywhere song off "Change Is a Sound"
• Jet-set jet
• Boom Technology product-to-be
• Pond-crossing option, once
• Heathrow lander
• One-time stratospheric streaker
• Mach 2 flyer of the past
• Former fast jet
• Brit. Airways retiree
• Its business is booming