You bought them on their DL#### codeshare flight number (what [AA or DL]-marketed means in GP's comment). I fly a lot of "Delta" flights that are entirely KLM

You bought them on their DL#### codeshare flight number (what [AA or DL]-marketed means in GP's comment). I fly a lot of "Delta" flights that are entirely KLM or Republic metal, often buying the Republic flights with Delta points earned on the KLM flights. (NB: the Republic airplanes say “Delta” on the side, while the KLM ones say KLM.)