 Mileage Plan is the frequent @-@ flyer program of Alaska Airlines and Horizon Air . The program 's airline partners also include Oneworld member airlines American Airlines , British Airways , Cathay Pacific , Japan Airlines ( from June 29 , 2016 ) , LAN and Qantas ; SkyTeam member airlines Aeromexico , Air France , Delta Air Lines , KLM and Korean Air ; as well as Fiji Airways , Emirates , Era Alaska , <unk> Airlines , <unk> and Hainan Airlines . The Mileage Plan program has no membership fee , allows one @-@ way redemption and accumulated miles never expire . 
