A Porter Airlines sign on a building at Billy Bishop Toronto City Airport. The city's waterfront and downtown office towers are seen across the inner harbour.Fred Lum/The Globe and Mail
Porter Airlines says its operations are returning to normal after a technical problem grounded all its flights Saturday afternoon.
The Toronto-based airline blamed the problem on a system outage, but didn't immediately have a specific cause.
Aircraft were grounded for about two hours and five flights were cancelled.
Porter said in an e-mail that about 400 passengers were affected, they were given a choice of rescheduling their travel plans or get a refund.
Porter operates flights out of Toronto's island airport to and from cities in Central and Eastern Canada, and seven locations in the U.S.