On 27 May 2015, Belgocontrol suffered from an electrical failure that paralysed the Belgian airspace for most of the day (from 9.30 AM to 5.30 PM), with many flights cancelled and redirected. Some of you were probably flying or about to take off when it happened. It is difficult for us to understand the reasons why the backups did not work. Lessons must be drawn from the incident to ensure it does not happen again in the future.