If a spaceship were to travel across the vast emptiness of space, enter Earth's atmosphere, and then find itself hovering above the busy ramp at Chicago's O'Hare Airport, can you blame those astronauts for deciding to just turn around and leave, without even stopping to say hello? According to about a dozen United Air Lines workers, including some pilots, that's just what happened one overcast night in November. The observers said they saw a flying elliptical object, dark gray and about 20 feet across, that hovered about 1,000 feet or so above the airport for several minutes about 4:30 p.m. They told their story to the FAA and the airline, who kept it quiet until a Chicago Tribune reporter got a whiff recently and started asking questions. The FAA at first denied any knowledge of the event, but after the Tribune filed a request for documents a record of a telephone call from a United supervisor surfaced. However, the agency has no intention of investigating. "When the lights shine up into the clouds, sometimes you can see funny things. That's our take on it," said FAA spokeswoman Elizabeth Isham Cory. Meanwhile, France's National Space Studies Center plans to post its own online database of UFO reports soon, maybe by the end of this month, according to Reuters. About 1,600 incidents are in the archive, with some 6,000 reports, including many from airline pilots.