This is probably why my UA.com booked flight this week now shows up as a CO flight with operated by UA. Sadly there is no indicator for UDU like pending or wait listed for my flight Wed. Called 1P line and they tell me I booked on CO, I say nope, never booked on CO in my life, your changeover messing with UA bookings. She says that I am on the UG list for CO. Too bad I do not have any status on CO until after the changeover. Very strange and frustrating!