Explore the 7 Largest U.S. Airlines (Slideshow)

With a combined market cap of nearly $130 billion, the seven largest domestic airlines carry a vast majority of air passengers in the U.S. They service hundreds of destinations all over the globe, flying more than 740 million revenue passenger miles (RPMs) – which is what you get when you multiply the number of paying customers by the distance traveled—in 2014 alone.

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