Want to know where that plane flying over your house is going? Or how many flights there are in the sky above New York? A new website makes it possible to track flights from all around the world from commercial airlines to private jets and even military aircraft.

Flightradar24's air maps are updated every couple of seconds. They allow you to track a specific flight across the globe and you can even see the plane's altitude and speed.

Wondering whether your loved one's plane will be delayed? No problem. You can log on and see which flights will land at any given airport in the next two hours. Stay at home until you see it on the map.

For really serious plane spotters, the website's data include aircraft model type, serial numbers and airline affiliation.

So how does it work?

Flightradar24 pulls data from the Federal Aviation Administration in the United States and the automatic dependent surveillance-broadcast (ADS-B) system in other countries.

Then they simply upload that data onto user friendly maps.

And if you think there are a lot of planes in the sky, well, there are even more than you see here. Only 60 percent of airplanes that carry passengers are equipped with ADS-B, so the map isn't even showing every flight there is.