Five years ago, a Horizon Air employee stole a Q400 Turbojet from the airport's cargo area and crashed it on Ketron Island.

https://www.king5.com/mobile/article/news/stolen-plane/horizon-plane-stolen-sea-tac-airport-5-years-ago/281-e00c61dd-3c12-4dde-8041-09e786d6e8bb