So I booked a return ticket MSP-AMS-DEL for a trip in July. For both KLM flights I got non preferred middle seats (no aisle nor window). When I tried to see the seat map by going in to the KLM web site using my Delta booking (1st July) it did not show me the seat map with a message I can try 3 days before flying. So I decided to do a pseudo booking for the same flights on KLM and see if I could pick seats. To my surprise when I went through the process of booking the same itinerary I saw some 40 seats empty including comfort, preferred etc and even a few aisle seats in regular seating at the back of the aircraft.

So my question is how should I go about at least getting an aisle seat. Should I use the Delta Platinum line or call KLM. I have no problem paying for a comfort economy seat on KLM. In the future should I make my booking on KLM web site instead of Delta web site?

thanks for your insight.