Originally Posted by
PsiFighter37
I looked them up first by paid fare, then by award availability. I would imagine both NRT-IAH and NRT-ORD are both UA/NH codeshare, even though both of the flights I was looking at were on NH metal.
If the search result says UA 7917 or whatever, that's a codeshare, and the inventory numbers don't mean anything with regard to awards. If the search result says NH 917, it's not a codeshare, and the inventory numbers
are meaningful.
Based on your description, it sounds like the former. O class in those search results refers to a paid Premium Economy seat, not an award.