i would bet that there are 48 standby non revs for that flight instead of 48 on the ug list that are booked on it. i have been to anderson afb a few times and when i was flying out to honolulu there was over 80 standbys for that flight, was told that alot of pacific islander ua employee families travel back and forth to honolulu. so if they are listed for f/j then they would show as standing by for the premium cabin