The airtracks is a complex powermove similar to the airflare. The airtracks is really useful for managing all the possible transitions in your combos to go for example from low (windmill) to high (airflare).

In addition, being comfortable on airtracks prepares you for much more complex movements like the "one hand elbow" if you want to go further with power moves.  

It's an interesting powermove that you can launch after a thomas (flare) to go back into a spin (airflare) or even to finalize your combo, airtracks + freez or airtrack + headspin or airtrack + 1990, many possibilities are available to you .