Originally Posted by rens

Have never had a problem getting AA to apply a SWU to a RTW ticket issued by another One World airline. Start by calling the ExPlt line for availability and they will coordinate/ transfer to the RTW desk for reissue. May take a day or so, depending on if both desks are open when you call. If upgrade space is not available when you call (often the case), you can waitlist

Looks like 2 SWUs to me. One for HKG-DFW-GRU and the second for EZE-DFW-LHR, assuming all flights are on AA metal and with AA flite numbers.