My understanding is UA will have to keep providing you with hotels and food vouchers till you get to CMX given this leg is part of an inter-continental journey and the * rules surrounding that apply. At a minimum you should ask for that and if you receive pushback show them page 152 of the Star Alliance manual. You should also still have access to the UC since this leg is part of an international itinerary (not that the UC is anything to write home about at an outstation like ORD).

As a UA 1K you should be top of the line for standbys and I would suspect UA would do everything to bump someone from the flight just to get you on given the amount of comp you are receiving due to * rules. Other re-routing options to propose include flying into MQT on AA (they've got an evening non-stop from ORD) and then arranging transport from there (2 hr drive). At this point given how long you've been stranded I suspect UA will have no qualms pushing you to another airline and the Star Alliance manual states this is an acceptable practice (again page 152).

Hope that provides some insight.

-James

With all due respect, that may be fine if you're driving in Texas. However, in the upper peninsula of Michigan, where it's not uncommon to have heaps of snow and icy, frigid conditions a 6+ hour drive can be quite the ordeal. I know, I've lived in Montreal and parts of SW Ontario where getting a couple of feet of snow is common and the temperatures can dip to -4 Fahrenheit. Right now in Calumet it's 17 Fahrenheit. The last thing you want to be is stranded in a rental car in the UP of Michigan during NYE!

If OP wanted to fly to/from ORD they would've ticketed from ORD and potentially saved hundreds of dollars on the itinerary for not having to add this segment in.

-James