Chicago-O'Hare International Airport is one of the two airports serving the city of Chicago. The other is the Midway International Airport, located closer to the center but with a lower volume of passengers. Located about 27km from downtown Chicago, O'Hare moved about 70 million passengers in 2008, making it the second busiest airport in the world in traffic, only surpassed by the Atlanta International Airport. Right in the center of the United States, it is a hub for travelers heading virtually anywhere in the world, including the Far East, the Americas, Oceania and Europe. It is the base of United Airlines and has 5 terminals. To get there, take the blue line Metro, or the bus (a slower option) or, of course, a taxi.