Police and emergency crews have swarmed Sydney Airport as injured and distraught passengers staggered off a small jet left smoking on the runway during a mock exercise.
The "passengers" were volunteers with authorities on Thursday practising how they'd respond to a real emergency.
About 500 personnel from 20 agencies conducted the four-hour exercise which involved 150 volunteers.
They acted as passengers who were affected after a domestic flight crash-landed on a runway following an engine fire.
Crews also role-played talking to victims' families and coping with the impact on residents and traffic near the airport.
The exercise - to ensure emergency responses are "robust and flexible" - was the largest conducted at Sydney Airport.
The response was similar to how agencies would deal with any terror attack.
Deputy Police Commissioner Gary Worboys told AAP the mock exercise would help weed out any issues in the state's emergency response plan.
"I feel very confident we are ready to respond, heaven forbid, if it did happen," he said on Thursday while apologising for any disruption to local residents.
More than 43 million people travelled through Sydney Airport in 2017.
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