The terror attacks of Sept. 11, 2001, forced big changes in airport security rules, and led to the creation of the Transportation Security Administration, which regulates what may be brought on board an aircraft. Visit the TSA's website to familiarize yourself with the restrictions.
Some prohibited items are obvious: Guns and other firearms, tools, martial-arts and self-defense items, explosive and flammable materials, and sharp objects are not allowed on board. You are also prohibited from bringing gel-type candles, gel shoe inserts and even snow globes.
Individual airlines may place certain restrictions on passengers in addition to those imposed by TSA. These restrictions can range from how many items you may carry on board, to how many "checked" bags --- larger items stored in the aircraft's cargo area --- you may have, to weight and size limits for each bag type (no more than 50 pounds for checked bags, less for carry-on items), and the cost for exceeding the weight limit (American Airlines, for example, charges $50).
Airlines also have different restrictions and fees for domestic (within the United States) flights versus international flights. In addition, the airlines will expect you to have proper identification (TSA-approved forms of picture ID, and any documentation necessary for flying outside of the country. Check with your chosen airline about luggage limits, ID requirements, and required documentation before leaving home.
You may find yourself at a disadvantage, compared to seasoned travelers, because you don't know your way around the airport. Thus, allow more time than your carrier suggests (American Airlines, for example, advises you arrive between 45 minutes and 2 1/2 hours ahead of departure time, depending on the destination), so you can locate a parking space, check in, get through security and find your departure gate.
