Great tool this for those wanting to track (or stalk) family & friends flying into and out of the USA as you can now track live flights on Google Earth.
As a lot of airlines on US routes have stopped the live map it is also handy to follow your flight a week before, place markers at specific time intervals (say every 15mins) and print it off, that way you know where you are even if it's cloudy
First of all got to Flightwise and select Airline, this will give a list of flights (you can use the flight No. but sometimes they are not always the same as what you might have).
Once you've got the correct flight No., such as Virgin Atlantics Gatwick-Las Vegas, 43G, just enter it HERE, and click the Google Earth button. You can then watch the flight live