XPLMLoadFMSFlightPlan
XPLM_API void XPLMLoadFMSFlightPlan(
int inDevice,
const char * inBuffer,
unsigned int inBufferLen);
Loads an X-Plane 11 and later formatted flightplan from the buffer into the FMS or GPS, including instrument procedures. Use device index 0 for the pilot-side and device index 1 for the co-pilot side unit.