If you wish to go up in a light aircraft and experience that then you may wish to post something on this thread in the private flying forum:-
http://www.pprune.org/private-flying...ilable-15.html
There are normally a few people across the country hour building and the offer to pay half the costs e.g. fuel and a cup of tea may get you an interesting ride somewhere. But as pug says Jump seating / visits to the flight deck is not allowed on commercial aircraft since 9/11.