Had a May flight scheduled from NRT - ORD in F. Previously a 615pm flight, now 945am. In addition to effectively loosing the last day of an already short 5 day trip, downgraded to J.

I'm flexible on the return date, within a few days. It seems like JAL should be willing to reschedule the date, within reason. My sticking point though, is keeping a F seat. Securing it, was the main impetus for the trip.

It sounds like JAL is unlikely to move me to a HND departure (to luck into a DFW or JFK flight). I'm flexible with flying into any North American hub from NRT though To retain a F seat, which routes should I focus on?