These are the 9 best airlines in America

• The Points Guy has released its annual list of the best airlines in the US.

• TPG's rankings feature America's nine largest mainline carriers including American, Delta, United, Southwest, Alaska, JetBlue, Spirit, Frontier, and Hawaiian.

• The rankings are based on a set of 10 criteria including tickets prices, customer satisfaction, and route network.

On Tuesday, The Points Guy released its rankings of America's nine largest commercial airlines. And for the second year in a row, Alaska Airlines has come out on top.

"It’s been a significant year for airlines and travel in America and we’re thrilled that Alaska Airlines has once again, come out on top," The Points Guy founder and CEO Brian Kelly said in a statement. "We take pride in the data we’ve assembled from sources across the industry and largely based all criteria on what we believe regular passengers care about most."

The carriers featured in TPG's rankings include American, Delta, United, Southwest, Alaska, JetBlue, Spirit, Frontier, and Hawaiian.

In 2017, TPG ranked 10 airlines. However, with the acquisition of Virgin America by Alaska Airlines, the new list will feature only nine carriers.

Each airline is graded on a host of criteria including ticket prices, ancillary fees, route network, on-time arrivals, cabin comfort, customer satisfaction, lost baggage, involuntary bumps, frequent flyer program, and lounges.

Here's a closer look at the nine best airlines in the US:

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