Index: src/order_cmd.cpp
===================================================================
--- src/order_cmd.cpp	(revision 12851)
+++ src/order_cmd.cpp	(working copy)
@@ -1009,6 +1009,26 @@
 	return CommandCost();
 }
 
+/** Check if the vehicle's orders are stations it can go to
+ * Also used for copying/sharing orders
+ * @param *v check the orders of this vehicle
+ * @param *dst (optional) against the type of this vehicle, if left out, *v is used for this param
+ */
+static bool CheckAircraftCanUseStationsInOrder(Vehicle *v, Vehicle *dst = NULL)
+{
+	/* Normal aircraft can't copy all the orders from helicopters (and visa versa) */
+	const Order *order;
+	
+	if (dst == NULL) dst = v;
+
+	FOR_VEHICLE_ORDERS(v,order) {
+		const Station *st = GetStation(order->GetDestination());
+		if (!CanAircraftUseStation(dst->engine_type, st))
+			return false;
+	}
+	return true;
+}
+
 /** Clone/share/copy an order-list of an other vehicle.
  * @param tile unused
  * @param flags operation to perform
@@ -1047,6 +1067,9 @@
 					return CMD_ERROR;
 			}
 
+			if (!CheckAircraftCanUseStationsInOrder(src, dst))
+				return CMD_ERROR;
+
 			/* Is the vehicle already in the shared list? */
 			{
 				const Vehicle* u;
@@ -1108,6 +1131,9 @@
 				}
 			}
 
+			if (!CheckAircraftCanUseStationsInOrder(src, dst))
+				return CMD_ERROR;
+
 			/* make sure there are orders available */
 			delta = dst->IsOrderListShared() ? src->num_orders + 1 : src->num_orders - dst->num_orders;
 			if (!HasOrderPoolFree(delta))