Which two major airlines merged in 2010 to create the world's largest airline at that time, combining their distinctive red, white and blue brand identities?

In the transportation industry, corporate mergers can create powerful new entities that reshape entire sectors. Airlines, in particular, have seen significant consolidation over the decades, combining iconic brands and their distinctive visual identities. This poll tests your knowledge about one of the most significant airline mergers in recent history that transformed the competitive landscape of air travel.

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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