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3. Sound barrier breaker: Abbr.

Alternative clues for the word sst

• The Tupolev Tu-144, e.g
• Bygone boomer
• Bygone jet, briefly
• Kind of plane: Abbr
• Mach 2 flyer of the past
• Jet plane
• Retired speedster
• Heathrow arrival
• Fast transport
• Old barrier breaker