Unmarked Planes and Hidden Geographies is a sustained investigation of a fleet of unmarked aircraft that use the callsign "JANET" in civilian airspace. Operated by the Air Force, the Janet Fleet exists in order to transport workers to- and from- a network of secret military installations in the southwestern United States. Unmarked Planes and Hidden Geographies uses flight-tracking data provided by the Federal Aviation Administration to follow the movements of this fleet in near real-time, slowly building up a historical geography of the aircrafts movements over time.