Just adding a data point for people as I ticketed a DONE4 ex Oslo yesterday, booked through the AA RTW desk.

Total price per person was €6,092 made up of €4,966 base fare and €1,126 taxes and charges. Airline surcharges were €557 and the balance was taxes.

Routing and carrier was as follows:

OSL-xDOH-JNB on Qatar
JNB-DOH on Qatar
DOH-ICN on Qatar
Surface segment ICN to HKG
HKG-CTS on Cathay
CTS-HKG on Cathay
HKG-DPS on Cathay
DPS-xHKG-YYZ on Cathay
YYZ-SEA on Alaska
SEA-CUN on Alaska
CUN-JFK on American
JFK-LAS on American
LAS-xLHR-OSL on American codeshare (BA metal)