US aviation authorities have suspended flights from all airports in the country for safety reasons.
The reason was frequency problems in the national airspace system.
Transport Minister Sean Duffy said the communications failure affected all air traffic control centres. The causes of the problems are established. It was also reported that a large-scale outage disrupted the Internet in the United States.
This is the third national ground for flights to the United States since attacks on September 11, 2001.