National Weather Service Meteorologist Ben Deubelbeiss works in the weather center of the FAA Chicago Air Route Traffic Control Center in Aurora.

Mark Black | Staff Photographer

Meteorologist Ben Deubelbeiss works in the weather center of the facility.

Mark Black | Staff Photographer

Traffic Management Unit manager Jon Hubbard discusses what his units does at the FAA's Chicago Air Route Traffic Control Center in Aurora.

Mark Black | Staff Photographer

The entrance sign to the U.S. Department of Transportation's FAA Chicago Air Route Traffic Control Center in Aurora.

Mark Black | Staff Photographer

Ben Deubelbeiss works in the weather center.

Mark Black | Staff Photographer

The Federal Aviation Administration emblem in the entryway of the Aurora Chicago Air Route Traffic Control Center.

Mark Black | Staff Photographer

Brad Wilcko works on simulated flights in the training room in the Air Route Traffic Control Center in Aurora.

Mark Black | Staff Photographer

The U.S. Department of Transportation's FAA Chicago Air Route Traffic Control Center in Aurora.

Mark Black | Staff Photographer

Jon Hubbard works in the Traffic Management Unit.

Mark Black | Staff Photographer

A computer monitor in the Traffic Management Unit at the facility shows every controlled flight over the United States.

Mark Black | Staff Photographer

A computer monitor shows the controlled flights over the middle and northeastern United States.

Mark Black | Staff Photographer

This unassuming building in Aurora houses the U.S. Department of Transportation's FAA Chicago Air Route Traffic Control Center.

Mark Black | Staff Photographer

The entryway to the U.S. Department of Transportation's FAA Chicago Air Route Traffic Control Center in Aurora.

Mark Black | Staff Photographer