Which major airline merger completed in 2010 created what was then the world's largest airline by fleet size, destinations served, and revenue passenger miles?

The airline industry has seen numerous consolidations and mergers that have shaped today's transportation landscape. One particular merger in the early 21st century created what would become one of the world's largest airline carriers, significantly altering the competitive dynamics of the aviation market. Test your knowledge about this transformative corporate merger that reshaped how millions of people travel by air.

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