COVID-19 Omicron: Canada will require new testing for travellers, adds three more countries to flight ban
https://news.yahoo.com/omicron-variant-covid-19-travel-rules-canada-flight-ban-214353685.html

Canada hates tourism.

Everyone flying to Canada from other than the US will now be required to take a PCR test at the border, and you'll be required to quarantine until the test result comes back. I know from personal experience that usually takes two, even three days.

They're also trying to extend that to all travellers, US included.

Omicron is in Canada anyway.