I am checking the award flight PVG-EWR, and it shows First Class Saver Award on PVG-LAX-EWR. Out of curiosity, I want to see how many seats available, I can see O1 on the PVG-LAX segment, but on LAX-EWR, the I bucket is 0, I thought the First Class Award should come from I bucket in the 2-class cabin. Is it not the case in this itinerary? Then which bucket does that award seat come from? Thank you.