Indigo Domotics

As of Oct 17 from Rogue Amoeba:

Thank you for getting in touch.
At the moment, we do not offer any URL scheme functionality in Airfoil Satellite.
However, we do appreciate your inquiry, so thanks for the suggestion!
We'll see what happens with our future developments - for now stay tuned for updates and let us know if you have any other feedback.

You beat me to it!

It would be super easy for them to add the code, I believe its only one line of code.

This was March 8; 2017:

Hi Korey,

Thanks for getting in touch. At the moment, there is no URL scheme functionality to launch Airfoil Satellite on iOS. However, it's a great idea for the future, so thanks for the suggestion! We'll see what happens with our future developments - for now stay tuned for updates and let us know if you have any other feedback.

--
Chris Richards
Rogue Amoeba