The Far-Reaching Consequences of Today's Chicago ATC Fire

An incident at the Chicago Air Traffic Control Center led the FAA to halt all departures and arrivals in the controlled airspace, affecting over 100 airports. This resulted in 1800 flight cancellations, impacting both Chicago O'Hare and Midway airports. The FAA had to coordinate with nearby facilities to manage overflights and communicate routing changes, affecting thousands of flights.

How did the FAA respond to the airspace being affected?

What types of flights were indirectly affected by the incident?