Originally Posted by
flugvergnugen
And the reason I'm asking is b/c I'm crediting it all to UA, where (in my understanding) operating-carrier fare bucket determines earnings.
The operating carriers fare bucket is what matters AFAIK.
This is exactly the scenario you had described, flight booked with LH in P fare bucket, but code-shared with and operated by AC.
Going by previous posts this maps into Z for AC, the operating carrier.
Since you want to post the miles to your MP account, you need to see MP webpage and figure out what an AC Z fare earns.
https://www.united.com/cms/en-US/mar...spx?itemid=313
I'm pretty sure this is how it works, I haven't been through this myself though.