Hi DF,
Here's a broad description from the AF site....
"About Angel Flight Australia
Angel Flight is a charity which coordinates non-emergency flights to assist country people to access specialist medical treatment that would otherwise be unavailable to them because of vast distance and high travel costs.
All flights are free and may involve travel to medical facilities anywhere in Australia."
A toll free call on 1300 726 567 will get them in Brissie during office hours for further info.
Cheers