Now that I've seen this several times I think it's worth noting:

The inventory displayed and loaded on united.com for 777-200 equipment flying p.s. routes is (almost always?) wrong. This is not just an Expert Mode issue; it will price flights, both revenue and award/upgrade, according to the incorrect inventory and error out on purchase if you are trying to book phantom space. For example, I saw two flights on a particular day which were

J9 ... Z9 ZN9 P0 PN0 R0 RN0 IN0 I0
J9 ... Z9 ZN9 P9 PN9 R9 RN9 IN9 I0

I was clued in to the oddity because I can't imagine a Friday evening flight to ever be IN9. Sure enough, trying to confirm an RPU on the second flight failed, and when I loaded the flights in EF, they were in fact

J9 ... Z9 P9
J9 ... Z9 P5

I called the web support desk and was able to confirm that the first flight had R space, whereas the second flight did not. So not only was there erroneously advertised R space on the second flight, but also booking a ticket on the first one would happily charge you a Z fare even though there was P space available.


I saw a similar issue about six months ago with phantom P space on a p.s. 772, so I think this is a pervasive bug which still has not been fixed.