Belgocontrol operated a “clear the sky” over whole Belgium (under 7,500 ft) this Thursday (19 July) afternoon.

There was a problem with the loading of flight data information. They are working to find a solution to the problem.

Belgocontrol operates a clear the sky. There is a problem with the loading of flight data information. We work to find a solution to the problem. — Belgocontrol_EN (@Belgocontrol_EN) July 19, 2018

The situation is back to normal after one and a half hour of empty skies over Belgium, but 20 flights had to be cancelled in Brussels and 4 Ryanair flight in Charleroi. The other flights might be delayed until the end of the day.