From August 2007, the US Department of Transportation Security Administration (TSA) will not prohibit carrying regular lighters in carry-on baggage. TSA is also amending laws regarding carrying bulk milk greater than 3 ounces (80 ml) if they are declared in a security screening facility.
Refrain from bringing packed gifts. Packaged baggage needs to be sent out beforehand. Bring only unpacked gifts with you and pack them up when you arrive. If your packed baggage vibrates the siren, TSA is forced to open it to investigate. (How to check baggage when passing through the scanner may differ, depending on the facilities at each airport)