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?