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3. Sound barrier breaker: Abbr

Alternative clues for the word sst

• U.S.S.R.'s Tu-144, e.g
• Mach-1 surpasser
• Rapid transit
• Air France flier until '03
• Bygone boomer
• Onetime boom maker
• Across-the-Atlantic flier of old, briefly
• Jet last flown in 2003
• Retired speedster
• Old fast plane: Abbr