Two light aircraft collided in the skies over south-west Sydney.
One pilot was killed as a result of the accident, NSW State Police said.
According to law enforcement, the collision occurred in the Wedderburn area.
One of the planes crashed in a wooded area, the pilot died on the spot.
The second plane managed to make a safe landing, its pilot was killed injured.
Rescuers and investigators are working at the scene. The causes of the plane crash are being established.