Which historic merger created the world's largest airline at the time (2013), bringing together two major U.S. carriers under a single brand identity?

In the ever-evolving world of transportation, corporate mergers have dramatically reshaped the landscape of travel options available to consumers. Airlines, in particular, have undergone significant consolidation over the past few decades, creating mega-carriers with expanded global reach. This poll tests your knowledge about one of the most significant airline mergers in recent history that transformed the competitive dynamics of the aviation industry.

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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