I've just spent 45 minutes on the phone with Delta special member services trying to book a flight using airline miles.  What a waste of time.  When you want to go to any destination where anyone else also wants to go too there are simply no flights available to use your miles.  
I need a flight from Baltimore to Paris...I asked for a few dates and nothing.  Then I asked for other flights.  Nothing.  For spite I asked for dates further out....No luck  Then I asked for any flight any time in the future using any number of connections from BWI to Paris or Dulles to Paris.  After 5 minutes on hold she came up empty.  
Finally I asked where can I fly too...
She said "Anywhere a sky team member flies, provided there is availability on the flight for award travel" 
Thanks, if I get the urge to fly from BWI to Toledo I'm sure there will be plenty of seats....