As of 2015, items the Transportation Security Administration allows on airplanes include laptop computers and cellular phones and liquids, gels, aerosols, creams and pastes of the a certain size that are properly contained. The TSA only allows some items on board an aircraft as checked luggage.
Travelers are technically able to carry extra film on board an aircraft, but it is better to place film in checked luggage, as the screening devices at security checkpoints can damage film.
The TSA requires that liquids, gels, aerosols, creams and pastes be placed in a quart-sized or smaller plastic bag, and the items must be 3.4 ounces or less per item. Larger items within these categories must be checked. Items that are exempt from some of these regulations include medications and infant and child nourishment.
Items that travelers can place in checked baggage but cannot carry onto an aircraft include pellet guns, realistic replicas of firearms, knives, razor-type blades and ice picks. Additional items for checked luggage include baseball bats, bows and arrows, pool cues, golf clubs, and hockey sticks. Items that the TSA prohibits as both carry-on and checked items include flares, gun lighters, gun powder, blasting caps, and chlorine for pools and spas.