Hi Denverhockeyguy.
It's UA 153 01/20. Showing lots left in Y. Does not show E+ even if inquire by requesting a refundable ticket. I wonder if I am one of those taken seats in Y.
I am showing confirmed on both the AC and UA websites, just says no seats available. If I knew how useless the AC booking site is turning out to be when it comes to code shares I would not have bothered. It seems as if UA treats codeshare pax as second class flyers.