Alaska Airlines said it now is using diesel-powered preconditioned air units in conjunction with ground-based electricity in place of onboard APUs at 19 gates at its Seattle hub. The ground units burn approximately 10 times less fuel than APUs and are expected to conserve more than 1.1 million gal. per year, saving $2.6 million at current prices. The carrier expects to have 14 more units in place at Anchorage, Portland, Ore., and San Francisco later this year. It also said it completed the ...

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