The temporary reduction in navigation and ATC user charges in Canada will be eliminated on December 31 in one of several steps Nav Canada is taking to stem a potential revenue shortfall resulting from reduced flight operations after September 11. This action will return user fees to the base levels established in September 1999 and will effectively lead to a 6-percent average increase in the costs of ATC and navigation services, effective January 1 next year. Nav Canada, the nonprofit private corporation that operates Canada’s air navigation system, also intends to make cuts in corporate overhead, operations, purchasing and contracting, major projects and employee-related costs.