Travelers with an Air Canada economy seat can upgrade to the next higher cabin of the aircraft using the available methods. The upgrades are subject to the seat availability in the higher class cabins. The Air Canada Upgrade to Business Class can be made using mile, paying in cash during check-in or by placing a bid directly through the official website. If you want to learn more about upgrades, you can contact Air Canada customer service or read the blog on the Airlines Group Travel website.