Which major airline merger completed in 2013 created the world's largest airline at that time, combining two American aviation giants with distinctly different brand identities?

The airline industry has seen numerous strategic mergers that have reshaped the competitive landscape of global transportation. These consolidations often combine complementary route networks, customer bases, and operational strengths to create more powerful market players. This trivia question tests your knowledge of a significant airline merger that dramatically altered the American aviation market and created one of the world's largest air carriers by fleet size and passenger miles.

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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