Audio of air controllers, the Southwest airplane and the business jet during a near collision at Chicago Midway Airport.
The Southwest plane performed a "go-around" to avoid a collision, circling to land safely about 15 minutes later.
National Transportation Safety Board chair Jennifer Homendy says investigations are ongoing into the near-miss between a Southwest airliner and a Flexjet in Chicago.
In a TV interview, the chair of the NTSB, said that the near miss with a Southwest Airlines flight in Chicago was due to the Flexjet crew's failure to hold.