Two things on this. One the vouchers have to be redeemed at the airport. Major downfall of the UA system. This is one area that DL has done very well. Like CO you can redeem all DL vouchers online but in addition, DL puts your vouchers into your DL account online. Makes it easier to use and keep track of in my opinion. Hopefully the CO system will come out of the merger as UA vouchers have no residual value although you can use thhem as $100 checks essentially.

To the original routing credit. I think you need to get the UA form for miles credit that they have and turn into UA and then ask CO to get the original routing credit. I am still having issues with 2,000 miles from November when UA re-routed me. UGH!