Belgium's air traffic operator, Belgocontrol, reported that the problem was solved and air traffic restored after flight space over Belgium had been closed due to a computer malfunction, which affected a flight data processing system.
Brussels Airlines reported that a flight from Moscow was the first plane to successfully land in the Belgian capital after the closure of the country's airspace.
Problem with flight plan data is resolved. Belgian sky totally open again.
— Belgocontrol_EN (@Belgocontrol_EN) July 19, 2018