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3. Former boomer

Alternative clues for the word sst

• Plane with a machmeter: Abbr.
• Erstwhile flier
• Retired cruiser
• Fast flier, formerly (abbr.)
• Fast transport: abbr
• J.F.K. visitor, once
• Letters denoting speedy jet
• Jet that once made a boom, in brief
• Concorde, in brief
• Black Flag's Greg Ginn's label