Strong winds in Sydney have reduced operations at the airport to just one runway.
Usually, the airport - which processes over 30,000 passengers every day - uses three runways.
Gusts of up to 90km/h have been forecast and pilots have reported strong wind gusts during the final part of descent. Some have had to abort their landing attempt and begin the process of landing all over again.
Passengers waiting to board their flights have been tweeting their frustration.
Stephen Mudd took to Twitter and described the situation as "chaos".
The strong winds were responsible for the massive dust storm that crossed Sydney yesterday, which also had a major effect on flights in and out of the city.
The dust cloud has now moved towards Brisbane and is expected to dissipate as it crosses the Tasman Sea.