With more than 900 flights canceled and 10,000 delays, there is a massive disruption to civil aviation in the United States. The reason is communication problems affecting several air traffic control centers.
Trump has already said the problem has to do with the Civil Aviation Administration's outdated equipment, which in some places is about 55 years old.
At the same time, the US president said that what happened apparently had nothing to do with either a cyber attack or artificial intelligence.
But the problem was quickly resolved and the planes were gradually allowed to take off.