Originally Posted by
ernestnywang
The base fare won't change unless you add continent, but taxes and fare surcharges may change with routing and / or carrier change, so you might be paying more than 125USD. I believe the penalty is per transaction not per sectors but others more experienced can confirm.
I can confirm the fee is per transaction - make a whole bunch of re-routing changes at the same, pay one USD125 fee
(I once changed ...PER-HKG-PNH-HKG-XIY,IKT-DME-AMM to PER-xHKG-DME,LED-TXL,BUD-xLHR-DXB - one change fee of USD125)
Taxes, fees and changes may increase or decrease (or stay the same).