Saved you a click: > The outside-in method (also known as “WilMA”, Window, Middle, Aisle) is even quicker, with an average of just under 15 minutes. > With this boarding procedure, passengers who have window seats board first, followed by those seated in the middle, and finally, the people who have aisle seats board last. United Airlines is the only big carrier to use this method, even though it’s been tested and proven to be quicker than the previous two approaches. One downfall to the WilMA method is that people who prefer the aisle (me!) might not have any overhead compartment space left since they’ll be the last ones to get on board. Despite that, this boarding process scores highest on the customer satisfaction scale.