Honestly, I wouldn't trust anything an AAirpass salesperson says about availability of Y-UP on any route and would record their representation that it would be available in the cases that they've indicated to you. I imagine the contract affords them flexibility to do / change whatever, whenever but I'd like to have that representation available for playback.
I certainly don't trust it, hence asking here. Sounds like there is NO WAY of telling if/when YUPs will be available. If there is someone currently on an AAirpass, would you mind logging in and browsing some random dates for LAX-ORD and ORD-LAX one-ways to see if the YUP is generally available? Probably not within a week, but maybe middle/end of October? Thanks in advance for any help here!