When you use miles or points to book a flight on a partner airline, like a United Airlines flight using Singapore Airlines miles, knowing which airline to call when a problem arises can be confusing.
Million Mile Secret Agent Rich asked:
If I book an American Airlines flight using British Airways Avios points, and there’s a problem with the flight, who do I call? Should I try and resolve the problem with American Airlines or British Airways?

Thanks for the question, Rich!
Who to Call Depends on What You Need
If there’s an issue with an award flight you booked on a partner airline, like a cancellation, delay, or misconnection, you should deal with the airline you’re flying with.
In Rich’s case, he should contact American Airlines if there’s a problem with his American Airlines flight. Even if he booked the ticket using British Airways Avios points.
The only reason he’d need to call British Airways is if there was an issue with the booking, like needing to change or cancel the flight.
So, if it’s a flight matter, contact the airline you’re flying with. NOT the airline you booked the ticket through. But if it’s a booking issue, contact the airline you booked with.
Of course, there may be a few exceptions to this rule. But those are rare and will be few and far between!
Bottom Line
If there’s an issue with your flight, you might wonder which airline to call when you’ve used miles or points to book a flight on a partner airline. Do you call the airline you’re flying with? Or the airline you booked the ticket with?
Generally, you deal with the airline you’re flying if there’s a flight issue, like a cancellation, delay, or misconnection. And you call the airline you booked with if you have a booking issue, like needing to change or cancel your ticket.
Any here is one I could not resolve: I used BA Avios miles to book an AA ticket from NYC to MIA. Due to weather, AA issued a travel waiver a few days in advance allowing changes to a different day (select days) for no charge. I called AA but they said they could not reissue the ticket, only BA could. But BA of course had not such waiver in place. Was there a way to effect the change?
So who do you call if the airline you are flying did a rescheduling change (say nonstop to 1 stop with 3 hour time change) that you don’t like, and want to get nonstop flight or better connecting flights? I have called the airline that I am flying with mixed results. Some making a free change , others saying go talk to you airline that I booked was th.