The longer runway can now be used by a new generation of larger, wide-body jets.
The airport's main runway has been lengthened by more than 500 metres to 3,200 metres — that's 10,500 feet.
The project took more than a year to complete and the runway opened for use in November.
The work included paving new service roads and replacing navigational aids, including new high-intensity lights at the north end of the runway.
Defence Minister Peter MacKay was expected to be on hand for the ceremony, as was Nova Scotia Premier Darrell Dexter.