This picture provided by J.P. Karas shows Northwest Airlines Flight 253 on the runway after arriving at Detroit Metropolitan Airport from Amsterdam on Friday, Dec. 25, 2009. A passenger aboard the plane set off firecrackers Friday, causing a commotion and some minor injuries, a Delta official said. Delta and Northwest have merged. (AP Photo/J.P. Karas)AP – A Northwest Airlines passenger from Nigeria, who said he was acting on al-Qaida’s instructions, set off an explosive device Friday in a failed terrorist attack on the plane as it was landing in Detroit, federal officials said.