Plane 3.9 Plane 3.9.x release discussions
Plane 3.8 This category is for discussion of issues related to Plane 3.8 release
Plane 3.7 This is for discussions of the 3.7.x releases of APM:Plane
VTOL Plane This is for discussion of all VTOL Plane types
Plane Simulation Discussion area for Software or Hardware In the Loop (SITL, HITL) <a href="http://ardupilot.org/dev/docs/simulation-2.html">Simulation</a> related to Plane.