Under what circumstance might a TFR be issued?

Temporary Flight Restrictions (TFRs) are issued to manage airspace and ensure safety during specific events or emergencies. A TFR can be employed in various scenarios including aerial demonstrations, major sporting events, and national security concerns.

During aerial demonstrations, TFRs help prevent unauthorized aircraft from entering the area and ensure that air traffic does not interfere with the performance and safety of the event. Similarly, during major sporting events, such as the Super Bowl or the Olympics, TFRs are established to protect participants and spectators by restricting air traffic over the venue, which could potentially pose a security threat or safety risk.

National security is another crucial reason for issuing TFRs. In situations where there is a heightened risk to national safety or security, TFRs are implemented to prevent unauthorized aircraft from entering sensitive airspace, especially near military installations or large public gatherings where the risks are higher.

Because each of these situations can warrant the issuance of a TFR to maintain safety and security in the airspace, the answer encompasses all these conditions.