SEATTLE (AP) — The Alaska Airlines pilot who lost consciousness during a Seattle-bound flight Thursday night, prompting an emergency landing, was suffering from food poisoning or a stomach virus, an airline spokesman said Friday.

The co-pilot of Flight 473 safely landed the jetliner in Portland, Ore., after declaring an emergency to get priority care for the pilot, spokesman Paul McElroy said. All of the airline’s pilots are trained to fly single-handedly.