Originally Posted by
rustykettel
My apologies,
AA may sell a BA flight outright with a BA flight number on an AA ticket (say BA123 on a ticket beginning 001xxxxxxx) and not stick their own codeshare flight number on it.
For a codeshare, which sounds like you're looking at, crediting to AS, look at the operating carrier's flight number (the metal, in this case BAxxxx) and not the marketing carrier's flight number (AAxxxx) for the eligible range.
In addition to looking at the operating carrier's flight number to see if it's eligible, you have to find the relevant booking code on the operating carrier. That can be much more difficult, since there's not always a 1:1 mapping from booking codes on the marketing carrier to booking codes on the operating carrier. But you can get a good idea by seeing where the marketing carrier's booking code fits into the marketing carrier's hierarchy and comparing it to the operating carrier's hierarchy.
As noted, by the official rules, there is no credit in the case of a codeshare flight where neither the marketing nor the operating carrier is AS. But I've never had a request for credit denied when both airlines are AS partners.