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3. Jet to Heathrow

Alternative clues for the word sst

• Bygone barrier-breaker
• Fast flyer of the past
• Once-and-future Mach 2 flier
• Erstwhile flier
• Heathrow plane
• Craft that once landed at Heathrow
• JFK arrival until 2003
• Past fast flier
• Heathrow arrival
• Grounded boomer