UA Upsell Offers to Business/First/PP at Purchase and Day of Departure (TOD)
Here's my latest one: Bought a 3-segment one-way from New York to Mexico for $215; the F/J price was $420. (First segment is very short, and the next two are wide open, so I'm expecting CPUs to clear.)
As soon as I purchased, the pop-up window offered me a buy-up for ... $840. Makes no sense. I could go into the reservation and buy up for the ~$200 fare difference.