In an experiment, a control is used to establish a baseline to compare the results of the main experiment to. Having a control group rules out any environmental variables, such as temperature and... In an experiment, a control is used to establish a baseline to compare the results of the main experiment to. Having a control group rules out any environmental variables, such as temperature and...
Knives, including small pocket knives, are only allowed in checked bags. Only plastic and round-tip butter knives are allowed as carry-on blades. Most bladed items are allowed in checked baggage, including scissors, razors, swords, axes, box cutters and blade tools, if they are properly wrapped or sheathed.
Other Luggage Restrictions. All sharp objects, including knives and scissors, firearms and martial arts weapons must be placed in checked-in luggage. Passengers can carry on tools that are smaller than 7 inches long. Athletic equipment, including ski equipment, pool cues, baseball bats and dumbbells, must be placed in checked-in baggage. Flammable liquids are prohibited on the aircraft entirely, except for cigarette lighters, which must be in a carry-on bag, and compressed gas cartridges for life vests.