ArriveCAN, mask mandates among changes as Canada drops COVID-19 border rules He says airplanes hold a lot of people in a small space and there can be COVID-19 transmission even with everyone masking.Keegan says he will still wear a mask to protect himself, but notes masking works best to prevent transmission when everyone is wearing one.The Public Health Agency of Canada still strongly recommends that people wear masks, particularly in crowded environments such as planes and trains..
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