diff --git a/src/GUI/new_gui.cxx b/src/GUI/new_gui.cxx
index c13456068..4f9485e92 100644
--- a/src/GUI/new_gui.cxx
+++ b/src/GUI/new_gui.cxx
@@ -68,6 +68,8 @@ NewGUI::init ()
     setStyle();
     SGPath p(globals->get_fg_root(), "gui/dialogs");
     readDir(p);
+    const std::string aircraft_dir(fgGetString("/sim/aircraft-dir"));
+    readDir( SGPath(aircraft_dir, "gui/dialogs") );
     _menubar->init();
 }