Every day this summer, Alaska Airlines will delight at least one guest seated in its Main Cabin with an upgrade to Premium Class to celebrate the start of the busy travel season. The new promotion, upgrade unlocked, started June 1 and runs through Sept. 2, allowing Alaska Airlines passengers to experience the airline with the most legroom in Premium Class.

Each day, the airline notifies one of its guests (and their travel partner, if they have one) through the Alaska Airlines mobile app or by email that they’ve been randomly selected to be upgraded from Main Cabin to Premium Class. Located behind First Class, these seats are typically reserved for the airline’s loyalty program elite members or for purchase.

Alaska Airlines’ Premium Class offers guests 4 extra inches of legroom, the most of any U.S. legacy airline; custom-designed leather seats; and complimentary beer, wine or cocktails for guests ages 21 and up on most flights more than 350 miles.

Premium Class guests also enjoy early boarding and are among the first to get access to overhead bin space and deplane.

Eric Edge, managing director of marketing and advertising, Alaska Airlines, said “Upgrade unlocked is one way we’re showing guests our appreciation for choosing to fly with us to their favorite destinations this summer. Premium Class is just one of the many premium products and services we offer to our guests, including our best-in-class lounges, the freshest West Coast food and beverage line-up and our award-winning Mileage Plan program with the fastest path to elite status. Whether it’s their first time or they’ve experienced Premium Class before – we can’t wait to hear from our guests who receive this surprise upgrade!”