Online flight tracking is a great resource for travelers and flight instructors alike. Websites such as FlightAware and flightwise are frequently used by friends and loved ones to watch the progress of airplanes enroute to their destinations. And if you don’t wish to actively track the flight, you can set up alerts that update you on the progress of the flight. These online resources help you plan for when it’s time to head to the airport to pick up the traveler.
For a flight instructor, flight tracking is a great tool as well. I always make my students file a flight plan for their required solo crosscountry flights and as long as they remember to activate the flight plan I can follow along as they fly or get the reassurance with an alert that they arrived safely at their final destinations.