What is biggest airport?

King Fahd International Airport, located in Dammam, Saudi Arabia, is the largest airport in the world by land area. It spans an area of approximately 780 square kilometers (300 square miles) and has the longest runway in the world, measuring 6,042 meters (19,824 feet). It serves as a major hub for domestic and international flights and can handle some of the largest aircrafts in the world.