Calgary Airports says all U.S.-bound flights are staying put while a nationwide ground stop unfolds south of the border. “We are monitoring the FAA nationwide ground stop,” Calgary Airports said in a statement Friday evening. “Departures of all U.S.-bound flights are currently being held at YYC until further notice. “We encourage travellers with flights scheduled for the U.S. to check with their airline for the most up-to-date information.” According to the Calgary Airports’s website, a 4:10 flight to Palm Springs, Calif., and a 3:55 p.m. flight to Phoenix, Ariz., are cancelled. The airport says it will share more updates as it becomes available. CNN has reported the following: All flights in the United States are grounded until further notice “due to extraordinary circumstances and for reasons of safety,” the U.S. Federal Aviation Administration said in a statement. The FAA issued the ground stop “following a communication issue impacting all Air Route Traffic Control Centers,” Secretary of Transportation Sean Duffy said in a Friday afternoon social media post. Flights currently in the air will be allowed to land at their scheduled destination, while international flights are being managed on a case-by-case basis. “FAA technicians are investigating the issue.” This is a developing story that will be updated as more information becomes available.