Use Mac OS X Mail to Track Flights
One of Mail’s many talents (this one does not require a plugin) is the ability to automatically detect when a flight number is present and then give you the option to view the status using the flight tracking Dashboard widget.
You don’t have to do much to utilize this tip, just next time you receive an email, hover your mouse over the flight number as shown in this screenshot.

If everything is working, the Dashboard will automatically open up and display the status of the flight like so:

Nice.
