Booked intra-US travel on DL, got KL E-Ticket
 

Yesterday I booked an intra-US itinerary operated by Delta via delta.com priced in US Dollars. I got the confirmation from Delta. Then, to my surprise, this morning I got an E-Ticket from KLM, priced in EUR.

Nothing wrong with that, but I was surprised. The only reference to KL in the booking is that I specified my FB account.

Is that normal? And why is that happening in the first place?

It appears normal. Any DL ticket bought with a NL adress is issued on a KL ticket. I had it myself a few weeks ago.

At which rate did they convert the USD to EURO? And, did they add a 10 euro booking or creditcard fee?

Pre-tax amount is USD 232.56. I don't see any booking or CC charges. The taxes, fees and charges are listed as EUR 13.28US 5.73AY 25.56XT. Grand total in EUR: 221.57

Using Dutch cards and cards of some Nordic countries is done by KLM. This was discussed at least in two threads. One earlier this year and another early last year (which I started when had a similar experience)...