What are my chances of switching from ARNG to ANG?

I recently relisted into the Army National Guard and signed a 6 year contract with a bonus and SLURP. I was in contact with the Air National Guard 2 months prior to my ETS. They were not letting me know if I was eligible or not. They recently reached out and told me I was eligible. What are the chances of me switching from Army National Guard to Air National Guard? If there is a possibility how do I make it happen?