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.

Southwest Flight 2504 performed a precautionary "go-around" to avoid hitting a private jet that entered the runway "without authorization."

A Southwest Airlines plane and a private jet that entered the runway without authorization experienced a close call at Chicago Midway International Airport on Tuesday morning, the Federal Aviation Administration said.