Native American flutes are commonly tuned to play one single scale, most often the Minor pentatonic. Prana flutes have professional concert tuning, meaning they will play the Minor pentatonic scale perfectly in tune, and extended with a full chromatic scale.
This chromatic scale creates many extra notes by cross-finger combinations so you can play numerous varieties of different scales, each with a unique feeling. Some of the possibilities are:
Minor pentatonic scale
Major diatonic scale
Arabian (Hijaz) scale
Blues scale
Aeolian scale
Miyako Bushi
If you want to be announced when new scales are added you can subscribe to my seasonal newsletter. I also have a pdf-file available summarizing the above scales that can be used as a cheat sheet:
Finger diagrams used in the above scales are courtesy of Clint Goss at www.NAFTracks.com