Originally Posted by Steve M

Back in the CO days, the flight manifest specifically did NOT show the fare class. The FA's had no way of knowing which passengers were award tickets, upgrades, discount fare, full fare, or whatever. I think they could tell a non-rev passenger. All that was listed was passenger name and OnePass elite level, but not fare class. So, based on elite level, they could tell in general how valuable a customer you were to the airline (to the extent the elite levels are accurate in measuring this), but it prevented things like a FA with an attitude against "free" travel giving a bad experience to a high-value passenger that happens to be on their once-a-year award trip with their family.