diff --git a/gui/dialogs/rendering.xml b/gui/dialogs/rendering.xml
index a59b34c37..1864ddf29 100644
--- a/gui/dialogs/rendering.xml
+++ b/gui/dialogs/rendering.xml
@@ -203,6 +203,8 @@
     </group>
     <group>
     <layout>vbox</layout>
+     <group>
+     <layout>hbox</layout>
      <checkbox>
       <halign>left</halign>
       <label>Aircraft</label>
@@ -211,6 +213,15 @@
         <command>dialog-apply</command>
       </binding>
      </checkbox>
+     <checkbox>
+      <halign>left</halign>
+      <label>Transparency</label>
+      <property>/sim/rendering/shadows-ac-transp</property>
+      <binding>
+        <command>dialog-apply</command>
+      </binding>
+     </checkbox>
+     </group>
      <checkbox>
       <halign>left</halign>
       <label>Scenery objects</label>
diff --git a/preferences.xml b/preferences.xml
index 9ee56cbab..8518b3be2 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -51,6 +51,7 @@ Started September 2000 by David Megginson, david@megginson.com
    <distance-attenuation type="bool">false</distance-attenuation>
    <draw-otw type="bool">true</draw-otw>
    <shadows-ac type="bool">false</shadows-ac>
+   <shadows-ac-transp type="bool">false</shadows-ac-transp>
    <shadows-ai type="bool">false</shadows-ai>
    <shadows-to type="bool">false</shadows-to>
    <shadows-debug type="bool">false</shadows-debug>