XPLMSetDirectToFMSFlightPlanEntry

XPLMSetDirectToFMSFlightPlanEntry

XPLM_API void       XPLMSetDirectToFMSFlightPlanEntry(
                         XPLMNavFlightPlan    inFlightPlan,
                         int                  inIndex);

This routine changes which entry the FMS is flying the aircraft toward. The track is from the current position of the aircraft directly to the n'th point, ignoring the point before it.