Airlines operating at Seattle–Tacoma International Airport are being warned they may need to conserve fuel due to a problem with a major pipeline that supplies jet fuel to the airport. Carriers have been advised they may need to “ferry” fuel into Seattle -- a practice in which planes load extra fuel at their departure city so they arrive with enough to operate their next flight without refueling at SeaTac. Law enforcement sources told ABC News that a crack in the Olympic Pipeline near Everett, Washington, is the cause behind significant delays in fuel deliveries to the airport. A law enforcement briefing obtained by ABC News indicates SeaTac’s fuel reserves could begin running low on Monday. Fuel is currently being trucked in rather than delivered via the pipeline, a process described as i

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