Worldwide and domestic flights were both affected by the fault in terminals one and two, with passengers and staff alike not able to pass security.
Long lines filled Terminal 1 and Terminal 2 on Friday morning, with both impacted by the glitch.
Passengers at Sydney Airport have faced major delays after a "technical" issues halted security.
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'Arrivals into Sydney are running as usual, and departures are expected to be operating as normal from midday onwards, ' he said. Almost 16 million of those were global passengers, with those from China being one of the major sources of travellers, according to airport figures. "We are working hard to catch up any delays", it said.
The technical glitch and subsequent delays come several months after flights were grounded at Sydney Airport's domestic terminal in September previous year, due to a technical fault with an air traffic control system, managed by Airservices Australia.
"We're working to resolve the issue as quickly as possible and thank you for your patience". The airport has now resumed processing passengers as per usual, it said on Twitter, without specifying details of the problem.
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The glitch affected outbound flights from its global terminal and one of its two domestic terminals.
Virgin Australia said that "due to a technical issue" passengers were being processed at reduced capacity.
At around 7:45AM Sydney Airport Tweeted that it was once again processing passengers in the affected terminals.
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