Air Canada late Monday was working to clear a backlog of passengers following what the carrier termed “computer-telecommunications issues” that affected both domestic and international flights.

“The computer and telecommunications issues affecting our operations have been resolved and we apologize for any inconvenience this situation has caused,” Air Canada president Ben Smith said in a statement issued Monday afternoon. “We appreciate our customers’ patience and we have arranged additional staffing to get our customers on their way as soon as possible.”

Air Canada said customers should expect “delays and some cancellations due to the outage.” The carrier did not provide any details on the number of flights or passengers affected, nor did it explain what caused the outage.

Air Canada first acknowledged the issues in a tweet at 11:14 a.m. Toronto time. “We’re currently experiencing an interruption at our customer contact centers and [our website],” the carrier said. We apologize for any inconvenience and are working towards restoring our service as quickly as possible. Thank you for your patience.” A similar message was posted on the carrier’s official Facebook page an hour later.

Tweets from several Air Canada hubs, including Toronto Pearson and Vancouver International airports, called the issue a “worldwide” outage. Toronto noted the issue was affecting the airport’s Flight Information Display System, and recommended that customers contact Air Canada directly for flight-status updates.

Two hours after the airline's first tweet, Air Canada followed up on Twitter, reporting that “airport systems, check-in & customer call centers are now all back online.” The carrier said it was “experiencing some flight delays, but we're getting everyone on their way.”

A third and—as of 5 p.m. Monday—final tweet on the issue sent at 2:38 p.m. reported that “operations were returning to normal.”

Sean Broderick,