LOS ANGELES – The Pentagon and NASA experts have determined that a billowing contrail seen streaking into the skies above Southern California was likely caused by an airliner and not a missile. The phenomenon recorded Monday evening by a TV news helicopter created a media sensation and a vapor trail of commentary across the Internet about the possibility of a secret missile firing. But the military insisted it knew of no rockets launched in the area. Defense Department spokesman Col. Dave Lapan said Wednesday that officials were satisfied it was an airplane contrail distorted by camera angle, winds and other...