This was the best way to get from airport to downtown Montreal. Just a 15 minute walk from the stop to our hotel in old Montreal made it very convenient! Runs every 15 minutes I think and is only $10 for 24 hour pass. You can buy a pass from a ticket machine or you can pay exact cash as you board in coins only. No bills accepted. Sure beats the alternative $40 taxi ride!! Bus was clean, drivers were helpful.