Originally Posted by
5DMarkIIguy
Yes, during the big sale.
Yes, I know the AM legs will give a lot of miles. My question is when AM rebooked on DL, wouldn't the fare be under AM rule, earning on AM rate, or would it be DL rate. And it looks like everyone thinks it's going to be DL rate. Everyone except DeltaAssist who can't answer the questions.
Yes, they are flying and they are crediting to their accounts. I get to use it.

I'm pretty sure the 2 letters at the start of the flight number is what matters. Most likely AM doesn't have codeshares on the new flights, so you'll have DL flight numbers and therefore DL earnings formula.
My best guess is that DL won't know what you paid, and will not automatically give your parents any credit for the trip. You will have to fax them your receipt, then you should be able to get miles per the DL formula. Getting miles per the AM formula will be difficult.
Everything above is merely my best guess.