Hi all, A bit confused - could use some insight. I am flying SFO-JFK on UA p.s. service in a few weeks - booked through CO, so it's a CO codeshare on UA metal. I recently matched my CO status to UA, so am 1K. I also transferred over 15,000 miles. I tried using the website to upgrade the flight, but it doesn't seem to work. Is this because it's a codeshare? Is it because I have my CO FF# in the reservation? Both? Thanks!