Mostly it means that under federal law it doesn't need to be transferred through an FFL in your state. If you buy it online it can be directly shipped to your house. Otherwise you should assume local and state regulations for firearms apply.
You're not going to be exempt in an airport. If a knife is a weapon, if a can of mace is a weapon, a pre-1898 black powder pistol is not going to pass.
Mostly it means that under federal law it doesn't need to be transferred through an FFL in your state. If you buy it online it can be directly shipped to your house. Otherwise you should assume local and state regulations for firearms apply.
See: https://www.atf.gov/firearms/firearms-guides-importation-ver...