Never mind I found the reason........
Travel Advisory for Flights to/from Halifax
July 1, 2005 - Runway reconstruction at Halifax International Airport may cause delays and cancellations to flights to and from Halifax, particularly during inclement weather. For further details, please see the Halifax International Airport Authority's information link:
Halifax Airport Authority
Customers with flights to and from Halifax are advised to check on the status of their flight prior to leaving for the airport by consulting the Air Canada website at www.aircanada.ca
or calling 1-888-422-7533, or by using a web-enhanced cell phone.
For July 1, due to the runway reconstruction and inclement weather with visibility below limits, Air Canada advises that flights to and from Halifax will be impacted for the rest of the day.
Customers with flights affected by the weather and wishing to make alternative travel arrangements can do so without penalty, space permitting, through Air Canada Reservations at 1-888-247-2262; TTY: 1-800-361-8071