We've lost two for sure: Yarmouth and St. Leonard. Charlo is in danger of being lost. In fact, they're working on an amalgamation with the city of Bathurst. There are a number of small NAS airports--less than 200,000 passengers--that are suffering in terms of capital requirements. They in fact are using the aeronautical fees that they collect for their daily operations.
On October 23rd, 2006. See this statement in context.