Yes (Less than 3.4oz/100 ml allowed). Checked Bags: Yes. For more prohibited items, please go to the 'What Can I Bring?' page. The final decision rests with the TSA officer on whether an item is allowed through the checkpoint. read more
It is a metal container pressurized with isobutane. You know, the same type of fuel camp stoves use. You could turn it into a frag grenade, an incendiary grenade, or a flamethrower with little modification. read more
De iure, you may not bring hairspray (or any other liquid in pressurized containers) onto an airplane, neither in your checked luggage nor in your hand baggage (this also applies to several types of deos or shaving foam, for example). read more
Aerosol toiletries such as hairspray or mousse are exempt from the TSA's ban on aerosol products in carry-on and checked baggage. The TSA notes that passengers can bring such products on a plane in "limited quantities," but an exact number is undefined. read more