All of above is pretty much correct, what has failed to be mentioned is the fact of starting in a country outside of SP, ie the problems of starting in France and passing though the French security with no boarding card.
In most Spanish airports this is possible when in uniform with your licence and ID card or if not, ID card and 'extra crew boarding card' or ' manual boarding card' - I wouldn't like to try it from France or the UK for example.
Hope this helps all.