WG, thanks for that reply, but I cannot understand why it is so secretive!
Anyway, I picked up a magazine today called Airliner World (January 2003) and there was a whole article on the operation of EsayJet. It gave me all of the info that I wanted. It stated clearly that they use computer generated flight plans by Jeppessen and gave an explanation of how it is implemented in their flight ops department. One call to Jeppessen to ask them about the system and they send me a whole demo pack.
Why can I get all this info from a magazine available to the general public but you guys wouldn't help me at all?