An already jittery Street was spooked this morning when an Air Force jet and one of President Obama's official planes flew low over the Statue of Liberty shortly after the market open. With memories of Sept. 11 still lingering in lower Manhattan, many employees fled their buildings -- including traders at the New York Mercantile Exchange Building and employees of The Wall Street Journal. The Federal Aviation Administration said the government was conducting a photo-op involving two Air Force F-16 jets and a Defense Department version of the 747. It said it notified city law enforcement about the mission. The NYPD said the flight "was authorized by the FAA for the vicinity of the Statue of Liberty, with directives to local authorities not to disclose information about it, but to direct all inquiries to the FAA."