CT4ME
Cleared for Takeoff
It looks like Xavion is going to be offering a significant update, so the product interfaces with autopilots, and can "land" your plane in case of a problem. I still think this program should become part of FF or WingX, but this update might get a few more pilots to look at the app.
http://www.engadget.com/2014/12/18/airplane-autopilot-xavion-ipad-app
http://www.engadget.com/2014/12/18/airplane-autopilot-xavion-ipad-app