Why cant you track SWA tail numbers?

I was wondering why you cant track SWA tail numbers, Is there any possibility of this in the future?

They won’t give us their registrations to track them…hem hem…go to planefinder.net and you will be able to track the 737-800s and the newest aircraft from Airtran with the funky registrations. For special schemes EX: Airizona/Nevada one you won’t be able to track. 8)