A UPS cargo plane sits on the tarmac of the north cargo terminal area at Hartsfield-Jackson Atlanta International Airport on Saturday in Atlanta. The discovery of U.S.-bound mail bombs on cargo planes in England and Dubai reveals the danger posed by air shipping, which is governed by a patchwork of inconsistent controls that make packages a potential threat even to passenger jets, experts said Saturday. (Associated Press)

Photo by: Erik S. Lesser

A UPS cargo plane sits on the tarmac of the north cargo terminal area at Hartsfield-Jackson Atlanta International Airport on Saturday in Atlanta. The discovery of U.S.-bound mail bombs on cargo planes in England and Dubai reveals the danger posed by air shipping, which is governed by a patchwork of inconsistent controls that make packages a potential threat even to passenger jets, experts said Saturday. (Associated Press)