Originally Posted by
Mike Jacoubowsky
Gotchas, meaning you're thinking that you might be able to switch to a UA flight but the miles might not credit towards MM status? That thought hadn't occurred to me; the idea here that it's what you originally booked that counts vs actually flown. If that's what you're getting at.

Almost. I was thinking the miles I'll get from the booked ANA-operated flight won't count toward MM status, and that I might be able to have them count if I could do a SDC to a UA-operated flight. Sounds from other answers that it's unlikely i can make the change--maybe unclear if miles could be counted to MM even if changed.
By the way, you still hang out on rbr or rbt?