Poking around some domestic flights for September travel, and noticed that on certain days UA613, the 1:15pm LAX-IAD 772, has greater PN inventory than P. For example, it is P4 PN9 on 9/9, and P0 PN3 on 9/10. Has anyone noticed a similar trend, either in the past or for currently bookable flights? As with the IN/I > PN/PZ cases we saw a month or two ago, I'm wondering if it's a glitch or change in RM practices.