Index: binaries/data/mods/public/simulation/components/UnitMotionFlying.js
===================================================================
--- binaries/data/mods/public/simulation/components/UnitMotionFlying.js
+++ binaries/data/mods/public/simulation/components/UnitMotionFlying.js
@@ -203,7 +203,7 @@
 	if (!this.reachedTarget && this.targetMinRange <= distFromTarget && distFromTarget <= this.targetMaxRange)
 	{
 		this.reachedTarget = true;
-		Engine.PostMessage(this.entity, MT_MotionChanged, { "starting": false, "error": false });
+		Engine.PostMessage(this.entity, MT_MotionUpdate, { "updateString": "likelySuccess" });
 	}
 
 	// If we're facing away from the target, and are still fairly close to it,
@@ -291,6 +291,11 @@
 	return 1;
 };
 
+UnitMotionFlying.prototype.IsMoveRequested = function()
+{
+	return this.hasTarget;
+}
+
 UnitMotionFlying.prototype.GetCurrentSpeed = function()
 {
 	return this.speed;
Index: source/simulation2/scripting/MessageTypeConversions.cpp
===================================================================
--- source/simulation2/scripting/MessageTypeConversions.cpp
+++ source/simulation2/scripting/MessageTypeConversions.cpp
@@ -281,9 +281,19 @@
 	return JS::ObjectValue(*obj);
 }
 
-CMessage* CMessageMotionUpdate::FromJSVal(const ScriptInterface&, JS::HandleValue)
+CMessage* CMessageMotionUpdate::FromJSVal(const ScriptInterface& scriptInterface, JS::HandleValue val)
 {
-	LOGWARNING("CMessageMotionUpdate::FromJSVal not implemented");
+	FROMJSVAL_SETUP();
+	GET_MSG_PROPERTY(std::wstring, updateString);
+
+	if (updateString == L"likelySuccess")
+		return new CMessageMotionUpdate(CMessageMotionUpdate::LIKELY_SUCCESS);
+	if (updateString == L"likelyFailure")
+		return new CMessageMotionUpdate(CMessageMotionUpdate::LIKELY_FAILURE);
+	if (updateString == L"obstructed")
+		return new CMessageMotionUpdate(CMessageMotionUpdate::OBSTRUCTED);
+
+	LOGWARNING("CMessageMotionUpdate::FromJSVal passed wrong updateString");
 	return NULL;
 }