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.
Before Your Trip. Check here before you check your bags. See which items can be carried onboard at no charge, view current checked baggage fee information and learn about our size and weight restrictions.Discover which items require special care and may incur additional fees, which items are considered hazardous by federal law and more.ee which items can be carried onboard at no charge, view current checked baggage fee information and learn about our size and weight restrictions. Discover which items require special care and may incur additional fees, which items are considered hazardous by federal law and more.