Herd immunity...not before 2022.How long Air Canada staffs & passengers + movies staffs from outside Canada will need to be tested????...
Quick answer...1 to 1.5 year.
https://cbc.ca/news/health/covid-19-vaccines-who-1.5869138 "World Health Organization" in a Pressrelease Jan11,2021 said" Covid-19 herd immunity unlikely in 2021 despite vaccine".
Datametrex could be selling a lots of tests before we get back to normal.