The American Federal Aviation Administration (FAA) has grounded all U.S. flights., and the Ottawa International Airport says flights to and from the country are currently impacted. The FAA issued the ground stop on Friday after a “communication issue impacting all U.S. Air Route Traffic Control Centers,” Secretary Sean Duffy said in a statement on social media. In a post on the social media site X, the Ottawa Airport said all flights to and from the U.S. are impacted “until further notice.” There are two flights scheduled to depart from YOW destined for the U.S., one to Boston and one to Chicago. There are flights scheduled to arrive in Ottawa from Chicago, Washington, Newark, Fort Myers and Fort Lauderdale. “Please check with your airline before travelling to the airport. We will update information as it becomes available,” the airport said. In statement to CTV News, a spokesperson for the Ottawa Airport said two flights turned back to the airport after departing. While no flights have been diverted to YOW as of approximately 6:30 p.m., the spokesperson says the airport is preparing for diversions. NAV Canada implements traffic management In a post on social media, NAV Canada said it is implementing traffic management measures at Toronto Pearson, Montreal-Trudeau, Calgary and Vancouver to “safely manage traffic volumes.” “Travellers should expected delays and check with their airline. Our systems are operating normally,” NAV Canada said. As of 6:55 p.m., the following Ottawa flights have been cancelled: