MONTREAL — Several thousand Canadians are dealing with delayed flights due to a technical problem at Sunwing Airlines, leaving some stranded and others out of pocket as they sought to return from trips abroad.

As reported yesterday, a network-wide system issue prompted delays for a number of Sunwing flights Sunday and Monday, hampering check-in and boarding processes as well, the company said.

It said the problem stems from its reservation systems provider, which also serves other airlines, snarling their traffic as well.

Sunwing’s website showed virtually all flights scheduled for Monday – more than 40 – had been delayed, some by more than 12 hours. Flight-tracking website FlightRadar24 showed no Sunwing planes in the air for hours-long stretches throughout the day.

Customers took to social media to register their frustration.

The company said it is trying to notify passengers “where possible,” with arrangements for hotel accommodations and airport transfers underway in some cases.

“We sincerely regret the impact this is having on our customers’ travel plans and are working diligently with our technology provider to resolve the issue as soon as possible so that regular flight operations can resume,” Sunwing said.

Passengers with trips scheduled over the next day should check their flight status, it added.