KLM Royal Dutch Airlines is a worldwide airline company based in the Netherlands. It comprises the core of the KLM Group, which further includes KLM Cityhopper, transavia.com and Martinair. KLM works very closely with Air France within the AIR FRANCE KLM Group, which exists since the two companies merged in 2004. The two companies continue to operate as separate airlines, each with their own identity and brand. They work closely together on existing core activities: Passenger, Cargo, and Engineering & Maintenance.The AIR FRANCE KLM Group is Europe\'s leading Group in the Airline business.