I'm sorry if you've received less than sympathetic service on the phone, however the reasons behind what's happening with your reservations is true. As the two airlines continue their progress towards a single operation there will be numerous schedule and equipment changes. Is there any reason that you absolutely must be seated with your mother? Does she require any special assistance? If so let United know this and they can notate both of your reservations. It may not keep you from being split up again if the flight number or aircraft type changes again but when you get to the airport you can request from the gate agent that you be seated together and they can usually work something out. If not, then you can always try to negotiate a seat swap once on the plane.
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