A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,409
MSP-ORD was upgraded at the window on a cheap fare. About four upgrades were done then and within the next day or so, four additional FC seats are occupied, leaving 4 of 16 available on my flight.
I didn't bite on the FCM offer of $72 each way, equal to the fare difference. It appeared around the time I booked, disappeared for the rest of my 24 hour cancel period, and then reappeared briefly at the same price.