There is an emerging "hobby" of flight tracking. Websites and apps offer close to real-time positioning, along with information on each aircraft and journey. FlightStats, FlightRadar24, and FlightAware, are some of the sites.
I use Apple devices but the apps are generally cross platform. These include app versions of the sites listed, but also PlaneFinder, FlightBoard (airport information), FlightUpdate, and FlightStatus.
So, my question is whether these would be permitted? I always wonder if these services are: used by professionals, dangerous, accurate, and useful (as a teaching tool).
Finally, this area has started relatively recently, and I'm sure, will have more and more services as the technology permits.
Thanks for listening.