AA's two announced routes--ORD-NGO and DFW-KIX--both seem to be tweaks at UA, given that UA just annouced SFO-NGO and ORD-KIX.
I'm sure UA wants to get a foothold in the NGO market before going to double daily flights, and they saw SFO as better than ORD as the first city. Will they match ORD-NGO? I doubt it.