Flightradar24.com is a real time flight tracking service that provides you with information about aircraft flying around the world and their location on a map. Clicking on a plane will bring up details about the flight, including the type of aircraft, altitude, speed and other information. You can even switch to a rendered “cockpit view” (using a Google Earth plugin) . Flightradar24.com also has apps for iOS, Android and Windows Phone.
Clicking on an airport would bring up the list of arrivals and departures. Below is a screenshot showing the listing for Piarco Airport, Trinidad and Tobago.
(H/T : The Loop)