Should portable humidifiers be added to all passenger flights?

As noted in an earlier thread, there is good evidence that higher humidity reduces the spread of airborne viruses, and the spread of COVID-19 appear to be reduced in tropical countries.

The air in commercial aircraft is notoriously dry even in humid weather. The problem is air outside the plane is about -40 F at flight altitude, so the cabin air is desert-dry by the it gets heated to room temperature.

Would it make sense to add portable humidifiers to commercial flights, at least during the COVID-19 outbreak?

Low humidity also exists in airports, train stations, trains, buses, subways, etc. during winter weather. Would it make sense to add portable humidifiers to those locations as well?

From what I see the costs and risks of adding humidifiers is trivial compared to the likely benefit.

Here is a link to the earlier thread that discusses the benefits of higher humidity:

Interesting. I hope this is accurate.

As far as the planes…They may not want to over humidify the interior. Extra H2O could create a variety of issues.

What kinds of issues do you see with higher cabin humidity?

Electrical… corrosion…mold.

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This is a very good point.

Those issues might be addressed with increased inspection and maintenance.

Some humidity is already present from people and from cooking, and humidity levels are normally higher at lower altitudes.

About 50% relative humidity a good value for most buildings. It is low enough to avoid problems with condensation and mold while still reducing the problems with dry nose and throat. That level of humidity also makes it harder for viruses to spread by air.

There are already severe restrictions on overseas travel. The alternative to reducing risk of virus transmission during aircraft appears to be a total shutdown of passenger air travel for an extended period of time.