Bit of a late reply, but I haven't frequented flyaway lately, sorry about that
The LDS 767 (fortunately!!) does not use the default FS9 flightplans. You have to enter one into the FMC. There are various ways to do so, the most realistic one available to simmers (to my knowledge, that is) is to open http://rfinder.asalink.net/free/
, enter the departure and destination airport, and the appropriate FL and it will return a proper flightplan.
Then start keying in the waypoints and airways using the RTE key on the FMC....
Writing the whole process out would take a while; you just need to have done it once. But after a while, you'll be able to do it with your eyes closed.
Anyway, if more is required, do ask.