Runway and ILS upgrades plus very thick fog means no flights in or out.
Other flights didn't fare better. Zoom airlines flight from Gatwick was diverted to Moncton, pax had to wait three hours for customs agents to show up (Moncton does not normally take international flights), and then pax are bussed to YHZ
canceled many flights today and yesterday, they're flying a 767 from YHZ
tomorrow to clear some of the back-log, instead of the usual A320 or CRJ-200.