In the US, the Federal Civil Aviation Administration reported that the departure of planes may resume. Transport Minister Duffy said the failure was caused by overloading of old systems. He stated this during a White House briefing.
"We are talking about TDM telecommunication technology - this is analog communication. Switches and routers were overloaded with data and crashed. They didn't just disconnect, but started releasing contradictory data. We stopped the system. With the support of President Trump, we have already replaced some of the equipment with new IP switches - and they have not failed. The problems arose precisely with the old equipment."