Computer glitches are causing major delays at Toronto's Pearson International Airport on Saturday.
Officials with the Greater Toronto Airports Authority (GTAA) said there are problems with the computer program that airlines use to register passengers at check-in.
"IT providers are on scene working to rectify the situation as quickly as possible, but it is expected that check-in will continue to be slow throughout the morning," the GTAA said in a statement.
"We apologize for the inconvenience that this is causing to passengers as they check in at the airport this morning."
Airline workers are checking travellers in manually, a more time-consuming process, the organization said.
As a result of the delays, the GTAA says passengers should plan for it to take longer to go through the check-in process, and is encouraging flyers use the airport's web check-in service before arriving at the transport hub.
There's no word yet on when the problems will be fixed.
Saturday's delays come less than a week after severe weather, including a deep freeze that afflicted much of central Canada and Northern United States, resulted in the cancellation of hundreds of flights at Pearson.
Federal Transportation Minister Lisa Raitt said she expects to see more from Pearson in the future after problems earlier this week.
"They need to make sure that as our preeminent airport, our number one airport in Canada, that they have a reliable transportation system and be part of it, and continue to learn from something that obviously didn't work out as best as it could," she said.