Is there anyone who's flown long haul & never picked up a respiratory bug? In early days of COVID, Qantas sent me this (as a freq flyer) "The risk of catching a virus on an aircraft is low" Here's a systematic review on COVID transmission in aircraft https://pmc.ncbi.nlm.nih.gov/articles/PMC8499932/
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The reality: depends on the virus. For instance measles would infect pretty much everyone on the plane.