The national flag carrier of the Netherlands, KLM (KL) is headquartered in Amstelveen near the airline's hub at Amsterdam Airport Schiphol (AMS). As a member of the SkyTeam alliance, KLM currently serves 163 destinations worldwide, of which 76 are intercontinental and 87 European. This includes points across Europe, as well as cities in Africa, Asia, Australia, the Caribbean, the Middle East, North America and South America. The airline's aircraft feature a three-cabin configuration: Business Class, Economy Comfort and Economy Class. On long-haul flights, the Business Class (known as World Business Class) features lie-flat seats. Thanks to its efficient network, its modern fleet and many economical measures, KLM's performance in terms of fuel efficiency is one of the best in Europe.