Here's another data point as I try to book a NRT-PEK trip.

ANA tool shows two NH flights available, one in both C and Y, the other in C only. They haven't added CA to the website yet, so no way to check on those three nonstops.

UA agent says: Only one flight is available, a CA flight -- in C only!

So it's easier to get CA C than NH Y? What's up with this?