Flight Tracker is an excellent application to track flights in US but if you get to see Casper you would fall in love with it. This application displays flight movement around Schiphol airports providing information about height, altitude, speed, aircraft type, call sign and departure of design.
You can actually see those small plane over google maps and around the airport. They drool around it slowly giving you an experience on how fast or slow it is. Also If you observer for a little longer time you would be able to see some flights do wait for landing instruction so either they stay there or circle around.
Frontier is the maker behind the Casper application and you can follow it on twitter here.