To contact Air Canada Reservations, call 1-888-510-8782 for general inquiries or for Aeroplan rewards, or use their website's online tools to manage bookings, with options for international numbers and direct help via social media for quicker support. 

Air Canada Vacations: Contact them directly if your booking was through them. 
Airport Support: Find information for airport-related customer service on their site. 

How Do I Contact a Real Live Agent at Air Canada Airlines