CHICAGO - Authorities call it the busiest square mile in aviation. It’s summer travel season and Midway International Airport is undergoing improvements in runway safety.

What we know:

The $47-millon rehabilitation of Runway 13C/31C includes repairing the main runway and its intersecting taxiways. They’ll install new runway guard lights and a roadway to support airport rescue and firefighting efforts in the event of an emergency.

This was planned long before the near collision captured on video in February. While attempting to land, a Southwest Airlines pilot saw a private plane crossing the runway. He pulled up and avoided catastrophe.

What they're saying:

Runway safety improvements come at a good time, as they go with all the other improvements inside the airport.

"Aside from the

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