Yes, KLM Royal Dutch Airlines is a primary and long-standing partner of Delta Air Lines. They are both members of the SkyTeam Alliance and participate in a highly integrated transatlantic joint venture alongside Air France and Virgin Atlantic. This partnership is exceptionally deep; as of 2026, the two airlines even serve as the official airline partners for major global events like WorldPride 2026 in Amsterdam. For travelers, this partnership provides seamless benefits: you can earn and redeem Delta SkyMiles on KLM flights (and vice versa), enjoy reciprocal lounge access for elite members, and book "codeshare" flights where a single ticket covers a journey on both airlines. The hubs of Delta (like Atlanta and New York-JFK) and KLM (Amsterdam Schiphol) act as interconnected gateways, allowing passengers to travel across the globe on a single itinerary with coordinated baggage handling. This alliance remains one of the most stable and commercially successful partnerships in the modern aviation industry.