jonerik writes "According to this article from Space.com, hundreds of sightings of enormous arrowhead-shaped aircraft that have been logged since the 1980s just might have been solved. According to a new report by the National Institute for Discovery Science, the craft (referred to as Big Black Deltas, or BBDs) are massive black airships on the order of 600 feet long, 300 feet wide, and 40 feet tall, weighing on the order of 100 tons and capable of carrying huge loads over long distances. Since a 2001 NIDS study correlated sightings of large triangular or delta-shaped objects with Air Force Materiel Command and Air Mobility Command bases throughout the United States, it's assumed that the BBDs are DoD transport airships. Dr. L. Scott Miller, professor of Aerospace Engineering at Wichita State University, agrees with much of the NIDS report. 'I do think that a large airship, with a heavy lift and other mission objectives, has been built,' says Dr. Miller. 'Lockheed has shown a great deal of interest in airships for many years. The real question is whether the Department of Defense has committed to buy and use such machines.'"