I am looking at an itinerary that would involve flying KIX-NTG on ZH next year in August. UA is showing bookable trips that include this segment (either with money or miles); however, Google Flights is not returning any nonstop results between these two destinations in August. Which source should I trust to be correct at this point in time? From the looks of it on Google Flights, it appears that KIX-NTG nonstop on ZH is only bookable out to the end of June as of now.

The follow-on would be this: if I book this trip (which would be EWR-SFO-KIX-NTG) on the outbound, and the booking does not stick, could I get UA to rebook on EWR-LAX-HKG-NTG (last segment on ZH)? For some reason, while I can book this on UA with money (via Google Flights), I cannot get UA to generate an award booking for this. I mainly ask because HKG-NTG nonstop on ZH appears to be bookable at this point in time.