Phuket Flight Radar
The excellent FlightRadar24.com website shows live flight radar data from all over the world (with a couple of blank spots like North Korea). If you zoom out for a wide view you can see just how many planes are in the sky at one time! The view below shows the skies around Phuket Airport.
Use the + and - to zoom in and out. You can click on planes to see their flight path and flight and aircraft details.
You can also view this on the FlightRadar24 website.
Phuket Flight Radar | The Phuket Weather Blog
More About Phuket : Jamie's Phuket Blog