This occurs frequently, not just on United. Airlines all claim that an advance seat assignment is not guaranteed. You are purchasing a seat on the flight, not a specific seat. However, when they oversell their flights you might not even get any seat. Overbooking should be illegal, but, I digress. I'm speculating that the reason seats get changed or deleted is that the major airlines might operate dozens of different aircraft types in dozens of configurations. When there is an aircraft swap, the seat you selected might not even exist on the current equipment, or a similar seat was assigned to someone else prior to the computer re-seating you. Any experts out there know why this happens?
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