Which major airline underwent a controversial logo redesign in 2013 that merged two distinct brands following a corporate merger, replacing a highly recognizable 30+ year old design?

The airline industry has undergone significant brand transformations over decades, with logos often reflecting changing market dynamics, corporate mergers, and shifting design aesthetics. How well do you know the stories behind these iconic symbols that adorn aircraft worldwide? This trivia challenges your knowledge of a major airline's logo evolution that represented a significant turning point in transportation branding strategy.

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American Airlines (merging with US Airways)
Delta Airlines (merging with Northwest)
United Airlines (merging with Continental)
Southwest Airlines (merging with AirTran)