As a more PC based individual, have used mobile.united.com, along with nilshomer’s Flight Status Tool for United Airlines to look at the booked levels of the premium cabins {avoiding the guessing from seatmaps} -- especially for those outside the normal time window provided on the phone app or united.com.

In the past week or so, I have been unable to see the Upgrade tab – it is grayed out? Is anyone else seeing that?
Note: The Upgrade tab is available and visible on the phone app and united.com -- but the time window of 4 days limits the advance travel query.

With a little poking, I discover for the normal Flight Status url, each view/tab has a unique url, in the form of
https://mobile.united.com/FlightStatus/XXXXXXXX?.........flight[/url] specific info......

each of tab can be accessed by replacing XXXXXXXX with
FlightDetails
SeatMap
StandbyList
UpgradeList
Amenities

And https://mobile.united.com/FlightStatus/UpgradeList?[/url] …… flight specific info …. is still able to access the Upgrade info.

Does anyone have additional info / experiences?