[jacurtis]

> "Pets shed, airplanes have carpeted floors and airplanes aren't exactly deep cleaned between flights, at least in non-COVID times."

Just to reinforce the truthfullness of this. Most planes only get cursory garbage removal between flights. Thats it! They are only cleaned every 24 - 48 hours. But a plane might make 4-12 flights between cleanings, and even these cleanings aren't serious. They do a vacuum and spray sanitizer on main surfaces, but that's it.

In fact one of the reasons that diseases spread so much on planes is not because of people on your flight or the re-circulated air as most people assume. But often disease spreads from people that sat where you are sitting on a flight 1-3 flights ago.

And of course allergenic have similar characteristics to viruses and bacteria. So they follow the same pattern.