The title of the world's busiest airport oscillates between O'Hare and Altanta's Hartsfield-Jackson. However, most of the world's airlines fly through O'Hare, so international travellers and those making transfers aren't likely to have much of a choice. These weather conditions sometimes cause air traffic control at O'Hare to hold traffic from smaller airports from even taking off. In the winter, snow and ice storms can cause delays, and during the summer, heavy winds can make take-off and landings dangerous. Although safety has never been a concern, O'Hare has one of the worst on-time records of any major airport.

O'Hare is huge, but it's from an era before airports had much in the way of amenities, and it's been stretched beyond capacity for a while now. This is no Changi, no Kansai in other words, it's nobody's favorite airport. It serves the city of Chicago and the rest of the Chicagoland area, with connecting flights to smaller cities throughout the Midwest. O'Hare International Airport ( ORD IATA) is one of the biggest and busiest airports in the world.