Process to Change AONE3 in US
I am in the US in the middle of an AONE3 which ends in Europe. I have used two of my 6 NA segments (LAX-JFL on QF, and JFK-BOS on AA). My remaining legs are currently ticketed "open" on AA: (i) BOS-SJU, (ii) SJU-SXM, (iii) SXM-SJU, and (iv) SJU-BOS.
I want to replace those four segments with:
BOS-DFW-BOS and BOS-MIA-BOS
How do I physically do this? Do I take this to the airport and wait a bunch of hours and pay $100?
The ticket was issued by a travel agent on CX stock. It is a paper ticket (computer written).