Hi, I apologize in advance for my ignorance...I'm sure the answer to my question is somewhere in the Forum, but I can't find it.
I have 120,000 United Mileage Plus miles. I know how to use them for United award flights and, via the United search engine, travel on partner airlines, say BOS-FRA on LH.
My question: am I able to call a partner directly, say AC, and use United Mileage Plus miles for an AC award flight?
Thanks in advance for your guidance.