Silver lining?  I must be drinking.  No, I’m quite serious.  There is a silver lining in the Christmas Day security incident on NW 253.  How so?  Frankly, it’s been a while since 2001, the shoe bomber, and whatever else.  We’ve had a pretty good run of luck with terrorist activity and aviation.  And I think that has made many of us who fly somewhat complacent.  With this, I think we have all been reminded that there are still some very bad people out there who don’t like us very much, and would love nothing more than to be successful in bringing down an airliner.  Look at the events of the last few days as a wakeup call.  Keep your eyes open, and if you see something suspicious, do us all a favor and let someone know.