However, one negative element of the trip was the incredibly disfunctional partnership between Delta and KLM. We flew OKC-ATL-AMS-EBB out and EBB-AMS-DET-OKC back. The full round trip was code-shared by both airlines, with KLM equipment on the flights in and out of Amsterdam and the rest with Delta equipment.
The first issue was that it turned out to be impossible to use frequent flyer miles to cover the flights. Not because there weren't seats, but because Delta said they couldn't get seats on the KLM provided flights and KLM said they couldn't get seats on the Delta provided flights. So it wasn't exactly true that we couldn't use frequent flyer miles, we just would have had to use twice as many as it should have been.
The next issue was that if you booked the flights with KLM you could only get amenities on the KLM provided flights (upgrades, special meals, priority boarding). If you booked with Delta, you could only get them on the Delta provided flights. This turned out to even be the case with seat assignments!
People, it is so bad that you are not even informed of SCHEDULE CHANGES on the flights provided by whichever company that you didn't book with!
At least KLM flew a modern plane with personal entertainment systems and such. The Delta equipment from AMS to DET was an ancient 747 with a couple of TV screens bolted to the ceiling.
More on the fun parts of the trip later.