Howard when the light is showing "flight mode" is flight mode actually on? Can you still get on line although you think that flight mode is enabled? If this is the case I think that on some laptops, Del in particular, after an upgrade or Macafee patch were showing the icon in the "action centre" lit at all times. I believe that it is something to do with your Notification settings which may be showing the top 4, or something similar from a list that can be collapsed to just show the top ones or all of them(about a dozen or so). If you have a look in Settings/System/Notifications & actions and look at the list there you may get an option to take it off the top of the list if it is there or to put it in the top 4 if it isn't.