Premium Class and First Class on Alaska-operated flights. Passengers can also upgrade to Premium Class, which offers 4 inches of additional legroom, early Alaska Airlines Seat Upgrade offers various seat upgrade options for passengers. Elite members of Alaska's Mileage Plan program are eligible for space-available complimentary upgrades Passengers can upgrade to Premium Class at the time of booking or at any time before boarding, and complimentary cocktails, hand-selected wine, and beer (where beverage service is normally served.