4. Turn soda into beer.

There are fewer restrictions on bringing nonalcoholic beverages on board than there are on liquor. Most lines, for example, allow you to bring up to a 12-pack of soda per person. One of the more inspired ways of getting cans of beer on board is to carefully open the case of soda and replace the center cans with beer. Before boarding, it's important to glue the sides of the box down so it looks like the case was never opened ... or so we hear.