Which two major airlines merged in 2010 to create the world's largest airline at that time, adopting a new combined livery but keeping one of the original brand names?

In the ever-evolving world of transportation, airline branding tells a fascinating story of corporate strategy and market positioning. This trivia question focuses on a significant airline merger that reshaped the transportation landscape and created one of the world's largest carriers. Test your knowledge about how major transportation brands have transformed through strategic mergers and acquisitions in the competitive aviation industry.

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United Airlines and Continental Airlines
American Airlines and US Airways
Delta Air Lines and Northwest Airlines
Southwest Airlines and AirTran Airways