SouthAussie
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Passengers with COVID-19 keep arriving in Canada on international flights
The above article also says that inflight transmission is low:
"However, it is important to understand the incidence of individuals contracting a communicable disease inflight is very low. As evidence, consider what are called 'cluster outbreaks,' where a group of people contract a disease at the same time and location. These are rarely if ever tied to modes of travel, whereas you often see reports of outbreaks arising from funerals, bars or other gatherings," Fitzpatrick said.
An Air Canada fact sheet says, "the reasons for the apparently low rate of in-flight transmission are not fully determined but are thought to include a combination of the lack of face-to-face contact, and the physical barriers provided by seat backs, along with the characteristics of cabin air flow."
I am not sure how much I agree with this, JMO.
Airlines have a vested interest in stating that virus transmission during travelling is very low. Too many airport workers have caught the virus.
In just the same way that Americold (based in Atlanta GA) has a vested interest in saying that the virus outbreak in NZ unlikely comes from goods stored at their facility.
Covid 19 coronavirus: Americold boss thinks virus unlikely to spread on frozen goods