A system failure in the air traffic control network occurred Friday, delaying flights mainly to eastern Japan, the transport ministry said. The problem started at around 11:40 a.m. at the ministry's Tokyo area air traffic control center in Saitama Prefecture, prompting departure restrictions at airports. The system was restored at around 12:20 p.m. During the disruption, information other than aircraft's location was not displayed on the control system screen, the Ministry of Land, Infrastructure, Transport and Tourism said.

https://english.kyodonews.net/news/2023/09/bf668ec5bfbb-flights-delayed-in-japan-due-to-glitch-in-air-traffic-control.html

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