As of 2015, important regulations from the Transportation Security Administration include the agency's list of prohibited items, its liquids carry-on rule and its list of approved checked baggage items. The agency also enacts special travel procedures for people with disabilities and medical issues, children, the elderly and members of the military.
The Transportation Security Administration's liquid carry-on rule allows passengers to carry on board an aircraft liquids, aerosols, gels, creams and pastes, so long as these do not exceed 3.4 ounces and are contained in clear plastic bags. Individual items in these categories that are larger than 3.4 ounces must go into checked baggage.
The Transportation Security Administration website has a list of items that are prohibited as carry-ons but are often acceptable in checked baggage. As of 2015, this list includes parts of guns and firearms, compressed air guns, realistic replicas of firearms, bows and arrows, and baseball bats. Items the Transportation Security Administration lists as absolutely prohibited on an aircraft are chlorine for pools and spas, fire extinguishers and other compressed gas cylinders, realistic replicas of incendiaries, spray paint and torch lighters.
All passengers, even those with medical conditions, have to go through the security checkpoints. Those with disabilities or medical conditions can give Transportation Security Administration officers notification cards to notify the officers of their conditions.