diff --git a/conf/messages.xml b/conf/messages.xml
index 59f62d036a..8c109fbb85 100644
--- a/conf/messages.xml
+++ b/conf/messages.xml
@@ -228,6 +228,10 @@
     <field name="nb_err" type="uint32"></field>
   </message>
 
+  <message name="NEW_AIRCRAFT" ID="0x04">
+    <field name="ac_id" type="string"/>
+  </message>
+
   <message name="AIRCRAFTS" ID="0x04">
     <field name="ac_list" type="string" unit="csv"/>
   </message>