Goodyear blimp

A blimp is a non-rigid or semi-rigid airship dependent on internal gas pressure to maintain its form. In the United States, the Goodyear blimp, with its illuminated advertising sign, has been responsible for numerous UFO reports. The Goodyear Company, located in Akron, Ohio, has a flight schedule which can be checked to correlate the time and place of a UFO sighting.