When to Tip or Remove Ones' Hat

[Cygnus]

But, to follow the other piece of logic regarding not donning when in a train station, your hands may be full of luggage at an airport, too, even though it's indoors.

Which is why I said this ahead of it:

...If it's indoors and you've checked your luggage...

(Emphasis added)

But you are correct; if I were carrying a load of bags, the best place for a hat would be on my head!