i have an itinerary that is LAX-NRT-PEK-ORD-LAX. the LAX-NRT as well as PEK-ORD-LAX segments are on AA. i plan on upgrading those using my eVIPs. however, the NRT-PEK is on Japan Airlines. this is all one ticket, one itinerary. is there a way for me to upgrade the JAL segment as well using another mechanism? thanks!