Set item 0 to '1' to turn off x-plane's flight model. At this point the user's plane will freeze and can be positioned by hand. See MovingThePlane for more info.
__Do not use__ the other items of this dataref. They will turn off AI plane movement, but this will be removed in a future X-Plane. Instead use XPLMAcquirePlanes to gain access to multiplayer and then XPLMDisableAIForPlane to turn off the AI.