If you check that the taxes and fees added to your RTW tickets are what you expect, have you noticed any discrepancies recently?

I'm flying an ex-JNB AONE4 that I've rerouted 3 times using the AA RTW desk. Each time, the rate desk seemed challenged, even though the changes seemed simple, e.g. adding LAX-ORD-LAX to the ticket. (The ticket had been issued with just the 4 segments I needed to make it around the world, so at that time it contained no NA segments.)

I'm not sure what the problems were - the RTW agent would say "the rate desk is having trouble, I'll call you back" and eventually I'd get the price. It would typically be less than I'd expected (from pricing the same RT on ITA) as if there was a tax component they weren't including, but as domestic taxes aren't that much (and AA doesn't add YR on domestic segments) it was no big deal.

Most recently I added Asian segments - HKG-DEL-HKG, HKG-MLE-HKG. ITA said YR was ~ USD230 for each of the two round trips and taxes were about $50 each. When the RTW desk called to tell me the price, the agent volunteered that it seemed too high and was sending it back to the rate desk. In fact the YR component was about $200 higher than I expected. Taxes were a bit ($10) on the low side.

As a check on ITA, I priced the trips on the Cathay web site; their price for carrier fees and taxes both agreed with ITA within exchange rate differences. Both Cathay and ITA included $15.50 HKG departure taxes that AA hadn't included.

A week later the rate desk stands by their price. Tax details are reasonable consistent (except for that departure tax) and they give no further explanation for charging $650 for total YR (vs. expected $460). Given that 3 tix are involved, I'd rather keep the $570 in my account rather than donate it to the airline, but that wasn't a choice.