The head of the National Transportation Safety Board (NTSB) has pinned blame on the near-collision at a Chicago airport earlier this week on the crew of the private jet that passed in front of a

A Flexjet private jet crossed the runway at Chicago's Midway Airport as a Southwest Airlines passenger plane prepared to land.

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