Useful Links

FlightRadar24

In addition to providing live radar tracking data, this website also has a free "playback" feature which allows you to replay recorded radar activity for the past 7 days, as well as a "multi-select" view which allows you to show the flight path of multiple planes at the same time.

Free websites with live radar tracking information:

ADS-B Exchange

The world’s largest community of unfiltered ADS-B/Mode S/MLAT feeders, providing enthusiasts, researchers, and journalists access to the globe’s most extensive flight data for unprecedented flight monitoring.

FlightAware

FlightAware is a digital aviation company and operates the world's largest flight tracking and data platform.