Federal Aviation Regulations part 91 discusses pilot emergency and flight restrictions. The Federal Aviation Administration, under the oversight of the United States Department of Transportation, created part 91 to give pilots specific instructions for the pilot in command during an emergency situation. The regulation states that the pilot in command is the person solely responsible for the airplane and that he or she has the final word concerning all decisions made during the emergency. Also, this regulation allows the pilot in command to deviate from a stated regulation in a state of emergency when deemed necessary. Federal Aviations Regulations part 91 section 91.145 covers temporary flight restrictions. Commonly known as a TFR, a temporary flight restriction limits an area of space from air travel. The section of the regulation describes a TFR as