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PHOENIX (AP) _ Hundreds of travelers faced delayed and canceled flights to all parts of the nation Saturday because the airplane fueling system serving all airlines at Sky Harbor International Airport stopped working for two hours.

The system delivers jet fuel through underground pipelines to the gates at all three of Sky Harbor's terminals, said Suzanne Luber, spokeswoman for the nation's fifth busiest airport.

``Delays are between a half-hour and an hour, and there aren't delays for every flight,'' Luber said.

An estimated 150 flights and 1,500 passengers were affected. A dozen flights were canceled.

A few planes that had enough fuel to get to their destinations or to other airports left Sky Harbor during the shutdown.

Officials suspect the cause of the shutdown was an electrical problem, Luber said.

The system is owned by the airlines and operated by Swiss Port, a fueling company.