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A passenger aboard an Alaska Airlines flight at Seattle Tacoma International Airport made a threat that prompted a major security response on Saturday, June 14, 2025. The incident occurred while the plane was taxiing at around 1 p.m. Alaska Airlines Embraer 175 (N636QX) flight #AS2123, operated by Horizon Air, was bound for Walla Walla, Washington. Alaska Airlines disclosed in an official statement that, as the aircraft was taxiing to the runway, a passenger verbally made a serious threat to the