My business is sending me on my first international trip ever to the Philippines for May 21-May28. However, when go to look at itineraries, all the CO options route me EWR-IAH-GUM-MNL which I understand. However, if I scroll down to the "Partner Airlines" section - instead of routing me on other *A carriers, I'll get the following:

EWR-NRT-MNL or EWR-IAH-NRT-MNL (with NRT-MNL on JL of all airlines! - why not ANA)
EWR-HKG-MNL (with HKG-MNL on CX - why even offer).

I don't understand why I'm not getting routed on Asiana via Seoul, or even ANA through NRT! JL and CX are not partners of CO in any way/shape/form!