Originally Posted by
jackal
Not sure this is possible. I believe you have to have an open account at the time the flights are taken. If your AS account had been open when you took the DL flights, and you had just forgotten to give DL your AS number, you'd have no problem submitting for credit, but I don't think AS accepts retroactive credit requests.
Some programs do (Amtrak Guest Rewards accepts, IIRC, travel up to either 30 or 90 days before your account is opened), but I'm pretty sure AS doesn't.
Still, it'd be worth a try--you never know! Just don't be surprised if they don't post.
I'm pretty sure AS does. Or did, at least. Although the T&Cs state;
Requests for retroactive credit for travel on Alaska Airlines or Horizon Air may be made online or by calling Mileage Plan Customer Care. Mileage may be credited for up to one year from the date of the qualifying activity. Mileage cannot be credited for activity that occurred prior to enrollment in the Mileage Plan Program.
I believe there has always been an "unwritten rule" that you can get credit for flights taken up to 30 days prior to enrolling. It may be a different story with partner activity. As you said it's worth a shot. If AS says no the OP should open an account with the partner's plan and see if they can get the miles credited there.