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Alternative clues for the word sst

• Flight has-been, briefly
• Boomer that's now retired
• Cross-Atlantic flier, once, in brief
• Booming jet of old, briefly
• Mach 2 flier, once
• Erstwhile Atlantic crosser
• Atl. crosser, once
• Certain plane: Abbr
• Flightless bird?
• Former Atl. traverser