SAN FRANCISCO (KRON) -- San Franciscans who raised their eyes to the skies Thursday afternoon may have seen something unexpected drifting along near the Coit Tower or above the Embarcadero. At around 2 p.m., a big white blimp was floating overhead. The blimp had no markings and was kind of a ghostly white as it floated past various SF landmarks and out over the Bay. Rain headed for SF Bay Area may impact holiday travel So, what was it? We first thought it might have been the Pathfinder 1, a prototype electric airship that is currently being tested out of Moffett Field in Mountain View. Photo: Alex Baker The Pathfinder 1 is an experimental blimp built by LTA Research. It has 12 electric motors and is controlled by joystick commands from the pilots in a "Zeppelin-built gondola," according to the LTA website. According to TechCrunch, the Pathfinder 1 is the world's largest aircraft and is funded by Google co-founder Sergey Brin. According to the tech publication, the Pathfinder 1 is expected to be test flown in and around Silicon Valley before being moved to Akron, Ohio, where LTA Research is reportedly planning an even bigger blimp -- the Pathfinder 3. However, an LTA Research spokesperson later confirmed that the blimp was an A-60 Airship. An A-60 Airship is a smaller aircraft that LTA Research’s certified airship pilots use to conduct ongoing flight training.