I used the extension of the CO travel waiver to adjust the routing of my upcoming ICN mileage run. Was flying ICN-NRT-EWR-DFW, am now flying ICN-NRT-HNL-ORD-DFW (whew!). Of course, this raises a few questions: 1. Can I upgrade the return with UA miles given my outbound was upgraded with a CO SWU? 2. Even if possible, should I do a mileage upgrade for the HNL-ORD-DFW portion? 3. Assuming I rely on UDU, should I use my 1P number on the itinerary for higher UDU placement and potentially "forfeit" the CO MM BIS miles or use my Onepass number and risk losing out on an upgrade as UA 1Ps and CO PEs get auto-upgraded ahead of me? I can try to switch the number mid-trip, but that carries considerable risk of screwup, and UA does considers time added to UDU list as a factor. I'm also thinking that Mileage Plus will likely relent at some point and include 2011 CO flights in the Million-Miler BIS equation.