Several thousand Canadians are dealing with delayed flights due to a system outage at the US based company that provides Departure Control Systems for Sunwing and other airlines. The problem is affecting passengers worldwide but Sunwing is the believed to be the only Canadian carrier.

The company said that network-wide system issue prompted delays for a number of Sunwing flights Sunday and Monday, hampering check-in and boarding processes.

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 naturally took to social media to register their frustration, with some complaining of a lack of communication from the airline

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, adding that passengers with trips scheduled over the next day should check their flight status.