The strategy of a couple booking the window and aisle seats in a row of three, hoping the middle seat stays empty, is a common travel "hack" that has mixed results in 2026. If the flight is not full, the middle seat is statistically the last to be assigned, meaning you might get a whole row to yourselves for free. However, with airlines increasingly using sophisticated algorithms to maximize "load factors," empty middle seats are becoming rare on popular routes. If someone is assigned the middle seat, they will almost always be thrilled to swap for either the window or the aisle so you and your partner can sit together. The "risk" is that you might end up separated by a stranger if the person in the middle refuses to move, though this is socially uncommon. To maximize your chances, travelers suggest picking a row in the back third of the plane, as middle seats in the front and mid-cabin are often filled first by basic economy passengers or late-bookers.