1700 Flights Grounded

A fire apparently set by an employee at a Chicago-area air traffic control center led to the cancellation of nearly 1,700 flights at the city's two major airports, snarling air traffic across the United States, officials said.

A fire apparently set by an employee at a Chicago-area air traffic control center led to the cancellation of nearly 1,700 flights at the city's two major airports, snarling air traffic across the United States, officials said.