Chicago O’Hare Airport, Dallas/Fort Worth International Airport and Atlanta's Hartsfield-Jackson International Airport rank as the world’s top three “megahubs” for international flight connectivity, according to a study by travel data firm OAG, a reflection of the strong U.S. rebound in air travel.
O’Hare is a United Airlines hub and DFW is an American Airlines hub. Atlanta is Delta’s largest hub.
OAG’s ranking of airports by international connectivity is based on the number of possible connections to and from international flights relative to the number of destinations served.