Chicago's O'Hare Airport 'People Mover' Service Back in Operation After Delay.

The Airport Transit System, also known as the "people mover," at Chicago's O'Hare International Airport was out of service for several hours on Sunday, causing major delays and frustrations for travelers. Shuttle bus service was active between terminals and the Multi-Modal Facility, but long lines and confusion added to the chaos. The cause of the service stoppage is still unknown.