We conducted a an investigation into whether it was feasible to alter the flight path over Katoomba (Blue Mountains), including what impact this would have on other routes.

Our investigation found this would adversely impact on safety and would not be operationally feasible due to the constraints of military airspace restrictions and air traffic control sector boundary and route segregation requirements.

We also found a change would negatively impact on communities closer to Sydney Airport.

A further investigation was conducted in 2017 for a noise improvement suggestion from the Aircraft Noise Ombudsman. This investigation found that the change would significantly increase complexity, did not meet accepted design standards and could have a negative impact on parts of the community closer to the airport.