KL coded DL operated upgrade, not eligible
 

I have a ticket I bought from Delta that is KL coded for the domestic US flights. As a PE it won't let me request EC or be put on the upgrade list for either EC or a first class upgrade. Anyway of changing that? The agents on the phone have not been able to do anything to change the situation.

Many thanks in advance.

What's a "PE" ?
If it means "PM" there is nothing they can do until T-24, at which point they can add you to the upgrade lists.

Correct. Until T-24 when DL gets control you're basically on a KLM FLIGHT since it's coded as KL. Within 24hrs control switches to DL who then operates under the DL FLIGHT number.

Basically a codeshare is a carriers flight that they know they won't operate so everything is sent over to the operating carrier to reserve space on their flight that operates at the same time. However the operating carrier can't process cabin changes till T-24. Otherwise the KLM and DL system won't be in sync and KLM being the marketing carrier would prevail. (resulting in downgrade)

When DL takes control do they recognize a PM booked on the KL flight as a DL medallion for upgrade purposes?

Many thanks for the replies.

(And yes I meant PM, sorry)