A corporate jet and an American Eagle passenger plane nearly collided Monday afternoon over O'Hare Airport, the National Transportation Safety Board said.

At 12:47 p.m. Monday, American Eagle Flight 4298 to Peoria was leaving runway 32L and a Learjet LR60, operating as a corporate flight, was landing on runway 9R, the NTSB said.

The assistant/monitor for the local air traffic controller saw the converging paths of the planes and told the local controller to tell the Learjet to go around. The American Eagle was told to stay low on departure.

Radar replays revealed the Learjet passed just 325 feet above and slightly behind the departing American Eagle, the NTSB reported.

The board is still investigating.

As a result of the incident, new procedures are in place for arrivals to runway 9R requiring specific coordination between approach control and the tower, the NTSB said.

The American plane was carrying 43 passengers and a crew of 3. It was not immediately known how many people were on the corporate jet and which company was using it.