(Seattle, WA) -- The FBI is at SeaTac Airport today to interview Horizon Air employees about Friday's theft and subsequent crash of a Horizon airplane. Coworkers of 29-year-old Richard Russell tell KING-5 the Horizon ground service agent seemed happy and normal in the days before he stole the plane. Coworkers also say he seemed to like his job and that he never seemed disturbed or angry. The former Oregon resident allegedly stole the empty Horizon Air Bombardier Q400 on Friday and performed tricks and maneuvers before crashing on a wooded island about an hour later. Search crews found human remains with the wreckage of the plane.