While the air transport industry welcomed news that millions of unvaccinated Canadians will soon be allowed to fly, experts and unions said a new influx of travellers could worsen the ongoing delays at airports across the country. The government announced that starting June 20 proof of vaccination will not be required to board a train or a plane in Canada. As of May 22, just over 18 per cent of Canadians — almost seven million people — did not have at least two doses of the COVID-19 vaccine.