score:11
Typically, you can claim Original Routing Credit (ORC) for the flights you were originally booked on. If you are rebooked on an airline on a different alliance, you can claim duplicate credit for membership in that alliance too.
Useful thread for AA: https://www.flyertalk.com/forum/american-airlines-aadvantage/1586992-faq-involuntary-reroute-original-routing-credit-orc-master-thd.html
Just to add my personal experience. I've been re-routed multiple times on AA flights intended to be credited to BA, and always received original BA credit. I've been re-routed to Delta and received both original BA credit as well as Flying Blue credit.
Upvote:1
I had a Lufthansa flight converted to train, and lost the miles; and had re-routings that resulted in more or fewer miles, depending on longer/ shorter routes.
So if you don't do anything, it is based on what you really fly.
Upvote:1
It probably depends on the alliance. Most of my involuntary rebookings involve American Airlines and I was usually credit the miles for the original routing, plus a hefty bonus for the troubles.
One time though I had a UA flight rebooked in AC and in that case I did get miles for both the original and the new flight, credited to different award accounts. In any case, I never ended up with fewer than expected.