What is the defining characteristic of Temporary Flight Restrictions (TFR)?

The defining characteristic of Temporary Flight Restrictions (TFR) is that they exist temporarily and are instituted to restrict unauthorized flight during their active time. TFRs are typically established for specific events or situations, such as natural disasters, air shows, or security concerns. These restrictions are not permanent; they are enacted for a limited duration and are meant to ensure safety in the airspace during particular circumstances.

While TFRs can indeed be issued primarily by federal authorities, this aspect does not capture the essence of their defining feature, which is their temporary nature. Additionally, TFRs can impact various classes of airspace, not just Class G, which is typically less restrictive than other classifications. Therefore, the notion of being temporarily active and focused on restricting unauthorized flights during that period is what fundamentally sets TFRs apart from other airspace restrictions.