Yes, flight trackers like Flightradar24, FlightAware, and ADS-B Exchange are completely safe and legal for public use. These systems do not "hack" into aircraft or government servers; instead, they utilize ADS-B (Automatic Dependent Surveillance-Broadcast) technology. Most modern aircraft are required to transmit their GPS position, altitude, and speed via radio signals for air traffic control safety. Flight tracking websites simply use a global network of ground-based receivers to "listen" to these public broadcasts and display them on a map. From a data privacy standpoint, standard apps are secure, though they may collect basic location or app activity data common to most mobile software. While some military and private VIP flights are "blocked" from public view for security reasons, the underlying technology is a vital part of global aviation transparency and is used daily by millions for everything from checking if a loved one has landed to aviation photography.