Your point 3 is a non sequitur. If air travel is magical and valuable, that doesn’t automatically mean it needs subsidizing. We sometimes allow magical and valuable things to go away if we find them not to be popular enough to garner widespread political support.

My statement is correcting a fact (descriptive) not proposing what to do about it (I.e. not prescriptive).

It’s very hard to imagine what the world would look like without subsidized air travel. I have to think long and hard to figure out if subsidies would actually be sensible for something like this. I can be convinced either way right now, but it would take a lot of good historical data on something very similar, perhaps has to be specifically air travel in countries that do and don’t subsidize it, and their economic outcomes, controlled for other factors.

But saying that air travel is somehow the same in kind as other kinds of travel is incredibly shallow and reductive. We get to travel orders of magnitude faster and to places we wouldn’t even be able to reach otherwise.