Here's how offsite random testing will work for international air travellers

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Starting Tuesday, international travellers arriving at four of Canada's major airports could be required again to undergo mandatory random COVID-19 testing after a brief suspension of the program.

The government hit pause on random testing for passengers considered fully vaccinated last month as it prepared to move testing offsite in an attempt to reduce long delays at airports.

The government maintains that random testing for air travellers is needed to detect new COVID-19 variants, although the opposition Conservatives and the tourism industry are voicing their disapproval of the decision.

Here's what international travellers will need to know before arriving in Toronto, Calgary, Vancouver or Montreal.

Travellers selected for random testing should receive an email notification within 15 minutes of passing through customs, according to a government news release.

"The email will contain information to help them arrange for their test with a testing provider in their region," the release says.

International travellers are still required to register through the ArriveCAN app or website 72 hours before their arrival in Canada.

Those arriving in Canada at one of the four participating airports who are catching connecting flights to other destinations might still be selected for random tests.

Passengers with connecting flights will not be forced to leave the airports in Toronto, Calgary, Montreal or Vancouver to go to a testing site in those cities.

Instead, the government says those passengers can go to participating testing sites at their final destinations or book virtual self-swab appointments.

Offsite testing for travellers will be conducted by private lab companies, such as Dynacare, LifeLabs and Switch Health.

The labs available vary by province. Travellers can check the government's website to learn where to go in their region.

An offsite testing provider may also send travellers to a pharmacy for a test.