The security alert is sometimes code yellow, sometimes orange, but is no longer Code Zippo. In April, the Transportation Security Administration banned lighters from commercial planes. Then the Zippo lighter company complained. By May, the government let people travel with lighters, if they were empty, and in checked bags. Now, in June, the government has recalibrated again. You can carry a filled lighter, if it's in a box — and, presumably, away from your shoe.