Haven't seen anyone mention what I believe is the most likely reason UA won't open up saver biz space so close to departure: existing passengers could easily exchange their standard award first class tickets for saver first, and get a ton of miles back. And for GS/1Ks, this is a no-brainer as the fee for changing is nothing. This is a total loss for United -- no new passengers, just less profitable ones.
I suspect UA will only have saver biz space the day of departure when saver space as been routinely available in the weeks leading up to the flight, thereby minimizing "trade down" risk.
Last edited by dkc715; May 2, 2019 at 3:31 pm