Long queues are forming at Sydney Airport as extensive delays continue.

Domestic travellers are advised to arrive two hours before their flight, while the advice remains three hours for international.

The airport is expecting 80,000 passengers to pass through tomorrow.

“It’s going to be really busy,” Sydney Airport CEO Geoff Culbert told Chris Smith.

He said the airport is currently operating at 60 per cent staff capacity.

“No one’s blaming passengers – the primary reason here is staff shortages.”

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Image: Nine News