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Passengers exit Brisbane International Airport, where a breach of the trans-Tasman bubble occurred on Thursday. (File photo) University of Canterbury mathematical modeller professor Michael Plank said it was clear that airports on both sides of the Tasman needed to “tighten up” their procedures for managing the movements of passengers before departure and during transit. The Brisbane Airport incident appeared to have been caused by mistake”, in his view. People bound for New Zealand should have been waiting in a different area of the terminal to arrivals from high-risk countries. The two groups were meant to remain physically separated at the airport. But because of human error the pair from Papua New Guinea were able to access a cafe in the “green zone” reserved for trans-Tasman departures.