Ground crews worked 12-hour shifts plowing, sweeping and spraying de-icer on alternating runways to keep Seattle-Tacoma International Airport open and operating on Wednesday, January 18, 2012.

Ground crews worked 12-hour shifts plowing, sweeping and spraying de-icer on alternating runways to keep Seattle-Tacoma International Airport open and operating on Wednesday, January 18, 2012.

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