When to Tip or Remove Ones' Hat

[Cygnus]

Addititonals -

You remove your hat to kiss a lady;

You keep it on in the train station (which makes me wonder about the airport).

Both of these seem quite practical - the hat is a nuisance when kissing and having a hat in your hand ensures it doesn't start wandering places it shouldn't be going (in public, at least)! The platform of a train station is generally out of doors AND your hands are likely to be busy with luggage and such.

I imagine the wearing of a hat depends on the airport. If it's indoor and you've checked your luggage, it would be entirely appropriate to remove your hat (you are indoors, after all). If you board the plane directly from the tarmac, I imagine it would be best to keep your hat on as you could be called out to board at any moment.