US air travelers' problems continue.
Despite the cancellation of the order to stop flights in the United States, thousands of passengers were stuck at the airports in this country and some spent the night at the airport.
According to the "FlightRadar24" website, more than 6,600 flights were canceled and 8,600 flights were delayed.
Also, another 1,500 flights were canceled for Sunday.
This disruption is the latest and most serious sign of increasing pressure on the US air traffic control system.
The Secretary of Homeland Security of the United States also said that so far there is no evidence to show that this disruption was caused by a cyber attack or unauthorized activation of the artificial intelligence system.
The researchers have not yet ruled out any of these possibilities.
It seems that this problem has a technical and mechanical origin.
Investigations are still ongoing.