KL/DL codeshare upgrade
Is it possible to upgrade using the MSP-AMS leg on the following itinerary using Skymiles? If so, can MSP-AMS be in M or does it need to be in B or Y? Do I research upgrade space via the Flying Blue website or via Delta?
KL/DL MSP-AMS
KL/HV AMS-AYT
KL/HV AYT-AMS
KL/DL AMS-MSP
We're booking in this manner because DL doesn't offer a through fare to to AYT while KL does.