The U.S. Transportation Security Administration (TSA) posted a new set of rules for individual travelers who attempt to carry prohibited items such as knives, firearms, and "incendiary devices" (e.g., fireworks) through an airport security checkpoint.
First, take a very, very thorough look through your carry-on bag, as well as your purse, laptop case, briefcase, backpack, or any other bag you plan to take with you on the plane, as well as the suitcases that you plan to check in at the airport. Leave home any items that might appear on TSA's list of prohibited items.
Second, don't argue with TSA screeners if they discover items that they consider to be contraband, or you may be hit with a stiff fine. Remain calm, and ask to speak to a TSA supervisor.