A way to track airline jets by tail number?

I have put the tail number on “My Aircraft” but I cant get it to show up for tracking? Can i only do this for private planes? The plane I would like to track is an American Airlines 757 with the tail number N624AA. If anyone can show me how to do this I would be very thankful!

We support tracking by tail number for a number of airlines (United, Continental, SkyWest, Singapore, Air Canada, Turkish, etc), unfortunately American doesn’t participate.

well darn, thanks anyways!