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Alternative clues for the word sst

• It's been out of commission since 2003 (abbr.)
• Fast one, for short
• Sound-barrier breaker of yore
• Retd. speedster
• Erstwhile flier
• It went boom, for short
• Fast but expensive transport
• Erstwhile rapid transit
• Former U.K.-to-U.S. flier
• Heathrow arrival