Yes, I did a recent delay claim via my Chase SR card and they wanted proof from the airline. But my Delta apology (which also had given me some miles) was sufficient for the claim. We also had a delayed baggage claim as well, though eventually didn't need it since Delta reimbursed for everything themselves.

FYI, the company that services the CSR claim was fast and easy, plus they ended up looking at all the details and even though I didn't give them all the documents they wanted to prove my domestic partner relationship, accepted what I gave and the statement I made.

Was pretty easy and satisfied with the process