At first look it isn't obvious that the Payne Stewart(golfer)/ Helios(2005 - 100+fatality) decompression crashes and 911 are related but from a aviation safety and security system view they are:

When a plane substantially deviates from its approved flight plan it is presently possible to have a remote pilot located in a secure simulator fly the plane to a safe landing at a remotely populated airfield. Over 70% of all fatal air crashes occurrences are readily preventable if handled correctly.