The Federal Aviation Administration (FAA) issues Temporary Flight Restrictions (TFRs) for safety or security reasons, such as:
- Natural disasters: Hurricanes, wildfires, volcanic eruptions, floods, and landslides
- Hazardous conditions: Chemical spills, toxic gas leaks, or fumes from flammable agents
- Security-related events: The United Nations General Assembly, hijacking incidents, or other national security situations
- Special events: Major sporting events, aerial demonstrations, or VIP movement
- Aircraft incidents: Aircraft accident or incident sites
NOTE: See FAA informational video below. At timestamp 21 seconds see image analogizing
TFR with "POLICE LINE DO NOT CROSS." I do not think the FAA issues TFRs on a lark or to humor people.