There are a few reasons why an airline might assign seats at the gate. One reason is that they may not know the exact number of passengers who will be on the flight until the day of the flight. Another reason is that they may want to keep some seats open for passengers who are willing to pay a higher fare.

Seeing "Seat Assigned at Gate" on your 2026 boarding pass usually means one of three things: you booked a Basic Economy fare, the flight is oversold, or there has been an equipment swap. For Basic Economy, airlines like Delta and United withhold seat assignments until the last minute to keep "preferred" seats open for full-fare passengers; they only fill in the gaps once check-in is closed. If the flight is oversold, the gate agent is waiting for "no-shows" to see exactly how many seats are available before placing standby or Basic Economy passengers. Occasionally, a last-minute change to a different aircraft type requires agents to "re-map" the entire cabin, causing assignments to be cleared. While it can be stressful, it rarely means you'll be bumped; it just means the airline is "juggling" the manifest to ensure weight and balance are correct or to accommodate families before boarding begins. If you are worried, presenting yourself at the gate as soon as it is staffed is the best way to secure your spot.