upupandaway
Considering the current security measure, to get to the airside for private visit is almost impossible and most airline have step-up airside security measure to restrict access. On the other hand depending on what you are into. Airport Operations have so many difference type of job, some may not be in the airside at all like our flight control centre based in Landside. Anyway nothing to see there...and by trying to gain access to airside as pure purpose could mean you never get there.
There are lots of summer job at the airport, why not try it out on your holiday..
Wish you best of luck on finding your search.