So I did a HUCA and got what seemed to be a new person to the AA rtw line. She put me on hold for about 15 minutes and came back to explain the change in fees. She kept mentioning the fee on flights that I did not change i.e. Canada and MNL ATH.

Do they reprice all fees or just fees on the flights that are being changed?

Also could I fall back to the existing ticket (I have already flown the first two segments) with no charge?

Thanks in advance.