diff --git a/src/Traffic/SchedFlight.cxx b/src/Traffic/SchedFlight.cxx
index ca84daa..9c42d67 100644
--- a/src/Traffic/SchedFlight.cxx
+++ b/src/Traffic/SchedFlight.cxx
@@ -291,14 +291,14 @@ bool FGScheduledFlight::initializeAirports()
   if(departurePort == NULL)
     {
       //zhongjin
-      //SG_LOG( SG_AI, SG_DEBUG, "Traffic manager could not find departure airport : " << depId);
+      SG_LOG( SG_AI, SG_DEBUG, "Traffic manager could not find departure airport : " << depId);
       return false;
     }
   arrivalPort = FGAirport::findByIdent(arrId);
   if(arrivalPort == NULL)
     {
       //zhongjin
-      //SG_LOG( SG_AI, SG_DEBUG, "Traffic manager could not find arrival airport   : " << arrId);
+      SG_LOG( SG_AI, SG_DEBUG, "Traffic manager could not find arrival airport   : " << arrId);
       return false;
     }