If you book a flight without a confirmed seat assignment—often common with Basic Economy tickets or last-minute bookings—it does not mean you don't have a place on the plane; it simply means your seat will be assigned at the gate or during check-in. In 2026, airlines use this "unassigned" pool to manage families and elite upgrades. If you check in 24 hours early and still don't see a seat, your boarding pass will likely say "Seat Assigned at Gate." When you arrive at the gate, the agent will assign you one of the remaining spots, which are often middle seats or seats in the very back of the cabin. In the rare event of an overbooked flight, those without seat assignments are technically the first at risk for a "voluntary" or "involuntary" bump, though airlines now offer significant compensation (vouchers or cash) to avoid this. As long as you have a confirmed "Ticket Number" (not just a reservation code), you are guaranteed a seat on that flight or a later one.