Final answer:
Sustained flight over open air assemblies with small unmanned aircraft, such as drones, is regulated to ensure safety and privacy, aligned with specific FAA rules and raising new Fourth Amendment privacy concerns.
Step-by-step explanation:
For Category 1, 2, and 4 operations over people, sustained flight over open air assemblies is restricted to small unmanned aircraft that meet specific regulatory requirements designed to ensure safety and privacy. This includes rules for electric flight, even though it is feasible for model airplanes and drones. The flight path of aircraft, including drones, is regulated to maintain safe distances and altitudes, similar to the way commercial airliners are managed by the Federal Aviation Administration (FAA). Moreover, with advancing technologies and the increased use of drones, privacy issues akin to those regarding the Fourth Amendment are emerging, as drones have the capability to monitor private property and personal activities undetected.