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A Porter Airlines plane landing at Billy Bishop Toronto City Airport on April 9, 2013.Fred Lum/The Globe and Mail

Porter Airlines says a major network problem is wreaking havoc with its flights on Toronto's island airport.

Porter says the "system wide network outage" was affecting its website, call centre and reservation system Tuesday night and delaying flights.

Some Porter flights in and out of the airport were cancelled.

Pearson International Airport says it was operating as normal.

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