Which aircraft manufacturer first successfully designed a commercial passenger plane capable of sustained supersonic flight that entered regular service?

The evolution of transportation has been marked by breakthrough moments that redefined what was possible. In aviation history, few achievements have been as significant as breaking the sound barrier. This milestone represented not just a technical achievement but a fundamental shift in our understanding of high-speed flight and aircraft design. Test your knowledge about this pivotal moment in transportation history!

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Boeing with the 2707 SST
Aérospatiale/BAC with the Concorde
Lockheed with the L-2000
Tupolev with the Tu-144 (which briefly entered service but was quickly withdrawn)