Which former military aircraft manufacturer launched the first commercially successful jetliner in the United States, transforming air travel in the 1950s?

Many military aircraft manufacturers have successfully pivoted to create civilian products or commercial divisions throughout history. This transformation represents one of the most significant industrial conversions in military history, with companies repurposing wartime technology for peacetime use. Test your knowledge about a famous aerospace company's post-WWII product launch that revolutionized commercial aviation and represented a major shift from military to civilian production.

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Boeing with the 707, which evolved from the KC-135 military tanker design
Lockheed with the Constellation, adapting their P-38 Lightning fighter technology
Douglas Aircraft with the DC-8, developed from their A-26 Invader bomber
Convair with the 880, derived from their B-36 Peacemaker strategic bomber