"Customers travelling on Air Canada flights will be subject to an infra-red temperature check at all airports, the first airline in the Americas to announce such measures system-wide. The non-invasive procedure will complement the existing government-mandated health questionnaire currently completed by all travellers to determine their fitness to fly. Customers who are deemed unfit to travel will be rebooked at no cost but be required to obtain medical clearance prior to travel."

I wonder what that medical clearance involves and how it can be obtained, whether in Canada or in another country.