Well, the official word from Cathay/CMB is
"If your reissuing the ticket you need to pay the fare difference to the current AONE4 fare which is LKR980,000. Also you need to pay the reissue fee USD125 plus any taxes."

The base AONE3 fare last year was LKR769,400, so the difference is about USD2000, using xe.com/ucc for mid-market conversion.

Not a sparkling bargain. I was under the impression that the fare difference would continue to be based on the fare table in existence when I first booked. Live and learn.

BTW the spreadsheet, which says it was updated just a few days ago, seems to have fallen victim to recent increases. It still lists CMB AONE3/4 fares at USD7079/7554. EF gives USD8146/9021. The EF AONE4 price matches Dulani's number above to within pennies, using xe.com conversion. That's an incredible increase - when did that come about, and did it affect other popular ports?

I can only cite my personal experience, FWIW.

I bought my first AONEX ticket in 2001 for 2002 travel ex-ARN (good price at the time). AA RTW set it up and it was originally ticketed through a travel agent. It was an AONE4. After ticketing, the price ex-ARN was increased.

I later converted it to an AONE5 (added South America) and one of the recongnized expert AA RTW agents did the conversion/re-issue. I was charged what the AONE5 price ex-ARN would have been at the time I originally bought the ticket.

Not quite the same situation and, recall, that at that time, one could get the other country's price when the ticket was purchased in the United States, but maybe it is helpful.

Thanks for the warm-fuzzy thought. Although lots has changed in those 5 years it costs nothing to get a second opinion, especially since the CX ticket morphed into an AA e-ticket along the way.

There's the distinct possibility that the AAgent will quote me the difference between an ex-NA AONE4 today and the ex-CMB AONE3 I paid for, as Millionmiler suggested earlier in this thread, but I can always say 'no thanks.'