So I'm writing from Chicago. Trip was supposed to be LGA to ORD Friday at 11am on UA metal, ORD to EWR today at 6 on CO metal. Ticket was booked through CO and UA Flight is codeshare. Outbound was smooth - got my upgrade, arrived on time. Because of my mom's birthday, I decided to see about switching to the 4pm return at about noon yesterday. Log onto CO website, itinerary was cancelled. Wtf. Called elite desk, waited for 7 minutes, got an agent. Neither she nor her supervisor could explain why my itinerary was cancelled. She also could only put me on the. Not only was I not going to get on the 4, but I'd lose my place in line for an EUA on an aircraft with 16 f seats vs one with 12.to make things worse, I wasn't able to check in at t-24 for some technical reason. so overall, this blew - no notification, couldn't check in online, couldn't get on the flight I wanted, still a chance but 99% sure I lost an eua. Upside - when I called in to have them check me in manually, the agent was able to put me on the 4pm in economy (at this point about t-16) so I avoided the SDC change fee. That being said, unlike the first two flights (which had open f seats), this one had been fully processed via the eua system so all seats had been allocated. I'm hoping a couple guys switch or miss so I can get up in the f cabin, but it's not looking good. Blerg. Someone is gonna get a letter.