Northwest Airlines flight 253 sits on the tarmac after requesting emergency help at Detroit Metropolitan Airport in Romulus, Mich., Sunday, Dec. 27, 2009. A passenger onboard the same Northwest Airlines flight route that was attacked on Christmas Day was taken into custody in Detroit on Sunday after becoming disruptive, officials said. (AP Photo/Charles Rex Arbogast)AP – Investigators piecing together a brazen attempt to bring down a trans-Atlantic airliner said Sunday the suspect tucked a small bag holding his deadly concoction on his body, using an explosive that would have been easily detected with the right airport equipment.