Almost equally confusing is the list of things that you can and cannot take on board the plane in your carry-on bag. Items that are obviously dangerous or could be used as a weapon, such as long knives, explosives, guns or large tools, of course cannot be taken on an airplane. You are allowed to carry on to the plane items such as safety razors, scissors with blades shorter than 4 inches and cigarette lighters.

The rules concerning checked bags can vary depending on the specific airline. Also, if you are traveling in coach or first class and whether or not you are traveling overseas can impact rules as well. In general, you are allowed two pieces of checked luggage, each weighing no more than 50 pounds and each measuring less than 62 linear inches. Every piece of checked luggage must be clearly labeled.

In general, the airlines advise you to check in at least 90 minutes for a domestic flight and at least two hours beforehand if traveling internationally. The airlines reserve the right to give your seat away if you have not checked in by a certain time - usually around 30 or 40 minutes before flight time. US airlines do not require you to reconfirm your flight beforehand, but it's a good thing to do.

So, if you are going to be flying, and especially if you have not been on an airplane recently, check the current rules with your airline or travel agent. You do not want to be one of the many people that are denied boarding their flight.

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