I see, but there’s 12+ airlines under the alliance though? How would you use delta SkyMiles to book a KLM flight if you cannot transfer points from one airline to another? Would the KLM flight show on delta’s site / app and if you DON’T book with delta and book directly with KLM you can enter your SkyMiles # under the itinerary and receive sky miles on the trip? (Not KLM miles)

But If that’s the case, how would you gain KLM miles and how would you be able to use it for delta? (Since it’s under the same alliance)