Government officials are questioning a passenger's account of alarming and suspicious behavior by Syrian musicians aboard a recent flight to Los Angeles, although a second passenger has corroborated the events. The second passenger, a frequent business traveler who asked not to be identified, provided a copy of her itinerary confirming she was on the June 29 Northwest Airlines Detroit-to-Los Angeles Flight 327, which was disrupted by 14 Syrian passengers later identified as musicians. The passenger, who was riding in first class, said the constant foot traffic and strange behavior she witnessed in the front cabin frightened her as much as...