Alaska Airlines is ranked No. 1 in fuel efficiency by the International Council on Clean Transportation, in a report released today.

The study is the first to quantify fuel performance for U.S. airlines and ranks Alaska and regional partner Horizon Air above all 15 so-called mainline U.S. carriers operating in the U.S. in 2010.

Alaska outperformed the least fuel-efficient carrier, Allegiant, by 26 percent.

Both Hawaiian Airlines and Spirit Airlines tied for second-best in the nation.

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