I purchased a ticket r/t IAD-GVA-BCN in February for 7/8 July through UA with LX providing the GVA-BCN sectors. United notified me today that the schedule had changed but when I called in, they said the fare code on LX had gone from W to T. Any idea why and whether there are any implications for me? I am not pending an u/g but curious how an airline can change your booked and paid fare bucket.