Flight cancellations are still plaguing Chicago's international airports, two days after an act of sabotage at a regional control center brought operations to a halt.
The Chicago Department of Aviation says that as of late Sunday morning, 550 flights had been canceled at O'Hare and 50 had been canceled at Midway.
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At the height of the travel misery Friday, more than 2,000 flights in and out of the airports were canceled, sending waves of travel disruption rippling across the country.
Authorities say a contract employee started a fire in the basement telecommunications room of a control center in the Chicago suburb of Aurora and then attempted to commit suicide by slashing his throat.
Thirty-six-year-old Brian Howard of Naperville was charged with destruction of aircraft or aircraft facilities.