https://www.nytimes.com/live/2021/01/02/world/covid-19-coronavirus#canada-will-require-incoming-international-air-passengers-to-test-negative-before-boarding-and-other-news-from-around-the-world

Canada will require passengers seeking to board international flights into the country to show their airline proof of a negative coronavirus test, in addition to entering an already existing, mandatory 14-day quarantine on arrival.

The new rule, which the government announced on Thursday, will take effect on Jan. 7 and will require proof of a negative PCR test taken in the previous 72 hours. PCR tests must be sent to a lab and can take several days to process, unlike the rapid antigen test, which gives a result in about 30 minutes.