Re: Computerized billing ...
On my honeymoon in 1991, driving through the French countryside near Darois (I think). Saw a sign pointing to the CAP aircraft factory. Knocked on the door and got a tour, seeing the raw materials (piles of wood) being turned into aircraft in stages. It appealed because at the time I'd just completed a PPL(A).
Got told to go to the nearby airfield the day after and look at the actual finished product. No trip in one, but seeing the transformation of the raw material to a finished aerobatic aircraft ticked my geek boxes...