Looking at heading to Argentina via TYO and PPT heading:
PDX-SFO-TYO-PPT-IPC-SCL-MDZ-SCL-LAX-PDX
150k AA on an explorer ticket.
Anyone know about availability from NRT-PPT via TN? Might be hard as it looks like they only fly that route M and Sat. You can route TYO-HNL-PPT also but neither comes up on the BA/QF website.