These need very little introduction other than a link and a visit.
Most display flights in realtime. A few are delayed for “security” reasons.
Check them out and explore what’s available. Some have chat rooms and forums where you’ll find radarspotters, both newbies and the more experienced.
Aircraft Tracking sites usually display all aircraft. Flight Tracking typically allow a search for a specific flight.
Aircraft Tracking WebsitesAtlas
www.flightglobal.com/atlasCasper
http://casperflights.com/FlightRadar24
www.flightradar24.comPlaneFinder
www.planefinder.netRadarVirtuel
www.radarvirtuel.comFlight Tracking WebsitesAeroseek
www.aeroseek.com/webtrax/Flightaware
http://flightaware.comFlightExplorer
www.flightexplorer.comFlightstats
www.flightstats.comFlightview
www.flightview.comFlightwise
www.flightwise.comFlyteComm
www.flytecomm.com