Flightradar24 is a free web service that will show you live Flight route in Europe. It is works on Google Maps. It is very simple and easy to use anybody.
To show Flight traffic goes to flightradar24 website then you can show lots of flight icons flying on the Google map web page.if you want to knoll more details about the plane click on plane icon flying in web page you will get more details about the plane it include plane type, speed, altitude, longitude, latitude, angle, track, Radar etc. When you click on plane you can also show the route of plane it means it will show you the staring points of the plane airports are indicated with a small blue x symbol.
You can zoom and adjust the maps easily you can also view planes in big and small view. You set the update time of the map 10 seconds to 30 seconds.