Air travellers have been warned to expect delays across Australia on Monday due to technical issues affecting the air traffic control tower at Melbourne Airport.
"As a safety precaution all traffic into and out of Melbourne has been slowed down," Airservices Australia said. "Flow on delays to the national air traffic network are expected."
The air traffic control provider has asked passengers to check with their airline for further information.
Melbourne Airport's website showed several flights by Qantas Airways and Virgin Australia Holdings are among those that have experienced delays.
A spokeswoman for Airservices Australia said the control tower had lost power at one point, leading to all flights being temporarily suspended.
However, power has since been restored and planes are once again flying, although there is a backlog of aircraft waiting to take off.
- Sydney Morning Herald