The Calgary airport is advising flyers to expect delays Friday morning, as there are network issues at its terminal. "Aircraft are continuing to arrive and depart YYC this morning," said the Calgary Airport Authority in an email. "The network issue is slowing the processing of passengers, which is causing some delays." The airport says its teams have isolated the root cause and are working on fixing the problem. They had been working on a "critical upgrade to internal operational systems" when some passenger processing systems, such as check-in kiosks and boarding systems, were impacted.

Source: CBC News March 30, 2018 16:38 UTC