My husband and I were driving home from a convention. I looked out the car window to my right and saw what first looked like a long, metallic blimp swooping near us toward the ground. It was moving about as fast as an airplane but was dead silent. I shrieked and pointed it out to my husband, who was driving. Structurally, it resembled a blimp but was long and narrow enough to be considered a cigar shaped UFO. I looked online to see if there are any military (or civilian) aircraft that resemble it and also asked my father, who was a pilot for years and is also an amateur astronomer. The closest thing I could find was a half-scale model of an airship that will be tested by the military in 2016 but to my knowledge hasn't been flown yet and is still being constructed.At the tail of the craft were flashing red and white lights, not unlike an airplane. I studied it carefully until it flew upwards and quickly out of sight. It could have been manmade, but the speed and complete silence puzzle me. I saw a flying saucer once a few years ago and was glad to have a fellow witness this time for an event.