Originally Posted by
WillBarrett_68
I am pretty sure it will not matter if it's a DL operated flight. Operating carrier is what determines lounge access in this case, and DL does not pay for sky team elite plus access to third party lounges, regardless of which program they get the status from.
Correct. If OP had been flying AF/KL then he'd get access as STE+. Delta however only provides it for STE+ (regardless of which airline status is with) to third party lounges when passenger is in J.