My bet would be that a technical issue developed which required attention. The flight probably could have continued to destination but then become AOG off base. Solution: divert to their technical base in Brussels where the aircraft can get immediate attention. Furthermore, since they may well have a spare aircraft and standby crew available at their main base, this would reduce any further delays to a minimum.
Last edited by Hotel Tango; 10th Jun 2018 at 13:39.