They provide live tracking on your flights with map. You can download the application for free using your iPhone, iPad, Andriod, Blackberry, Symbian and Windows Phone 7. You will need internet access to used this application on your device; you may also track from their website (http://flightaware.com). You will need to register an account with them to be able to set alert or notification.
What I like about the application:
1. You can create alerts on the flights you want to monitor/track
2. It tells you if a plane is delayed or not
3. You can track flights by flight number, by tail number and by flight route
3. You can track flights by flight number, by tail number and by flight route