Earlier today an accord was heralded that seemed to end a protracted dispute about early retirement provisions. Air traffic controllers would no longer have to turn up to work from the age of 58 - the present cut off age is 55 - and they would receive 85% of their salary.
Later in the day it emerged that the Christian union was rejecting the draft deal saying that a number of points hadn't been worked out sufficiently. The Guild of Air Traffic Controllers too opposed the draft accord.
Dominique Dehaene of the air traffic control agency Belgocontrol: "We can't guarantee that flights will be able to land or take off after 5PM."
The Guild's call to throw a sickie could also disrupt traffic at the regional airports.