Computer issues at Pearson International Airport have slowed down the check-in process and created long lineups for travellers.

The glitch comes on the heels of a weather-related shutdown of the airport on Tuesday that stranded thousands of travellers and created a backlog that took several days to work through.

"We are having software issues that are affecting some of the check-in systems. The (self-check-in) kiosks that are in the terminals are working and we have extra staff that have been dispatched to help at the departures level," Shereen Daghstani of the Greater Toronto Airport Authority told CP24 Saturday morning. "We are telling our passengers to check in online before leaving the house."

The slowdown at Pearson began at around 5 a.m. as passengers scheduled to depart on the first wave of Saturday flights began showing up at the airport.

"I have been here since about 7:15 a.m. and six people that work here so far have given me all different answers on where to go," one traveller told CP24 Saturday morning.

"It has been hectic," another traveller said. "None of the kiosks are working, so you are here; you are there and you have a big lineup wherever you go."

It is not known when the issue will be resolved.

Fog may cause further delays

In addition to delays related to the computer glitch, the airport is also warning travellers about potential delays related to the weather.

The City of Toronto is under a special weather statement due to the potential for extensive fog throughout the day and travellers are being advised to check their flight status before leaving for the airport.

As of 11:30 a.m., about 6.1 per cent of all departing flights and about 5.8 per cent of all arriving flights had been cancelled at Pearson.