Thanks for the report it was a good read.
I asked the GA if most Sat AM flights were overbooked in Y. She said yes, that Sat am was probably my best chance at an op-up to DEN. SFO too I asked – not so much she replied. Probably won’t book too many Sat AM flights in order to get an op-up though. I prefer my bed to 1D any day.
You'd have to do this fast as starting March 19th there will be no more op-ups ex-TUS for UA elites