No, KLM Royal Dutch Airlines is not "part" of Virgin Atlantic, but they are very close strategic partners. KLM is part of the Air France-KLM Group, while Virgin Atlantic is a separate entity that is 51% owned by the Virgin Group and 49% owned by Delta Air Lines. However, these three giants (Air France-KLM, Delta, and Virgin Atlantic) operate a massive Joint Venture for trans-Atlantic travel. This means they coordinate their schedules, share revenue on certain routes, and allow passengers to earn and redeem miles across all their loyalty programs. If you book a flight from London to Amsterdam, you might find yourself on a KLM-operated flight with a Virgin Atlantic flight number (codesharing). While they are legally separate companies with different branding and headquarters, for the average passenger, they function as a single, seamless network across the Atlantic and Europe, providing a combined fleet and a massive array of connection options that would be impossible for any of them to offer individually.