Which major airline merger completed in 2013 created the world's largest airline at that time by fleet size, passenger traffic, and revenue?

How well do you know the corporate history behind today's major transportation companies? Many of the brands we recognize today are products of significant mergers and acquisitions that reshaped the transportation landscape. This poll tests your knowledge of a notable merger in the airline industry that created one of the world's largest carriers and significantly impacted global air travel patterns and customer loyalty programs.

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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