Originally Posted by SK AAR

But Sir/Mme, you are not looking at a UA issued ticket. You are making a dummy booking on the TK website for a TK issued ticket, which is different from a UA issued ticket. You can't use the info on the TK website to anything when you are inquiring about a UA issued ticket.

To avoid your doubts and any issues, I suggest you book with TK rather than UA. Why do you want to book ORD-ISD-ADD with UA? - when UA is not operating any of the flights. Do yourself a favor and book with the carrier your are flying with. It will also be much easier in case you have schedule changes or cancellations to your flights.