Canada’s chief public health officer said today there’s little evidence — if any — of COVID-19 transmission among passengers travelling by air.

For example, Air Canada — the country’s largest carrier — passes cabin air through High Efficiency Particular Air (HEPA) filters about 20 to 30 times per hour during flights. The result is a mix of filtered air and fresh air from the outside.

The filters are similar to those used in hospital operating rooms and, according to Air Canada, are extremely effective at trapping microscopic particles as small as viruses and bacteria, along with dust, pollen and moisture.

WestJet also uses a HEPA filter system and says it “captures and filters 99.99 per cent of all airborne particles so you can breathe a little easier.”

https://www.cbc.ca/news/politics/covid-transmission-flights-extremely-rare-1.5797065