Gary/Chicago International Airport (IATA: GYY, ICAO: KGYY, FAA LID: GYY) is a public airport three miles northwest of Gary, in Lake County, Indiana, 25 miles (40 km) southeast of the Chicago Loop. It is operated by the Gary Chicago Airport Authority, the basis for which was formed by the Chicago Gary Airport Compact signed in 1995. Nearby highway connections include I-90, I-80, I-94, I-65 and the Chicago Skyway.

Gary/Chicago International Airport was once served by Pan Am, Southeast Airlines, SkyValue Airlines, Skybus Airlines and Hooters Air, with flights to cities such as Hartford, Connecticut; St. Petersburg, Florida; Greensboro, North Carolina and Myrtle Beach, South Carolina. Prior to its bankruptcy in 2004 ATA Airlines planned turboprop service to several Indiana cities by its subsidiary, Chicago Express/ATA Connection, but the service was never started as Chicago Express Airlines was grounded in March 2005. Before ultimately choosing to serve Chicago O’Hare International Airport in 2006, JetBlue Airways considered flights to Gary/Chicago International Airport.

Gary/Chicago is the official “third airport” for the Chicago metropolitan area, supplementing Chicago’s major airports, O’Hare and Midway. Gary/Chicago Airport has been designed with an eye towards growth, and the administration is courting airlines aggressively.