Which major airline merger, completed in 2013, created what was then the world's largest airline by fleet size, revenue, and passenger miles?

The transportation industry has seen numerous corporate acquisitions, mergers, and rebranding efforts that have shaped today's market landscape. Major transportation companies often have complex histories with surprising origins and connections to brands we know today. Test your knowledge about one of the most significant brand transitions in the airline industry that changed the competitive landscape forever.

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