I am still trying to make out some of the interchanges between UA and CO when it comes to our bookings and codeshares on the two carriers. I have some flights booked on the CO site with CO flight numbers, but save for one segment all are UA metal. Curiously, the one CO metal flight shows on the UA site as having the upgrade "confirmed" (well before the Plat/1K window) even though the CO site shows it is still in coach, and that F is full on the flight. All the other flights, even though booked in coach now show NF as the booking class on the UA site. Am I to take it that all bookings by elites now automatically get converted from their original coach booking class into NF so they are now in the auto queue for UDU upgrading?