Remember we only "Integrate" an AIRAC when we use an aircraft with AIRAC driven navigation. We only choose "AIRAC Bias" when we want frequencies from the AIRAC, since we may still need frequencies from the simulator scenery with many aircraft. Otherwise we can still keep an AIRAC selected, and the SID STAR information is still used to create routes around airports.
Here's some help on setting up the AIRAC and Exports, using the Q400 as example:
AIRACs
on the startup page right-click for the popup menu and choose AIRACs
point to the AIRAC folder of PMDG, iFly, Level-D, AXE, or IF10 (get IF10 AIRAC from NavDataPro, an old set is available from the link in the IF10 help). if it finds a suitable AIRAC it will ask to be integrated, and re-index. Allow that. The "Sim Bias" simply shows frequencies from the sim rather than the AIRAC.
Exports:
On the Flight gen page choose Export, bottom left. On the dropdown list choose the Q400 file type. Choose the path to the Q400
C:\Program Files (x86)\Lockheed Martin\Prepar3D v3\SimObjects\Airplanes\mjc8q400\nav\routes\IF.fpr
IF.fpr is added on the path as the suggested file name, it's easy to type into the FMC, but you can use "ICAOICAO.fpr" which will supplant the airport codes into the name like "EGGDLFRZ.fpr".
Each time a flight is built, the plan is sent to the Q400 folder, and the user or missing waypoints are added to the Q400 nav data base. The nav data base is cleaned of old data each time and remains as installed. (install latest AIRAC for Q400 too).
Routes:
In the Flight gen page choose as a starting point:
Plan type: IFR, Approach Waypoints Included (or VFR)
Plan Builder: Any Airways,
on Mission page (button near the bottom next to Save button)
choose Computed Approach, and Initial Departure Fix.
You could instead choose IDF SID, and FAF STAR - these find the relevant SID/STAR for the weather runways and route, and add in the Transitions and FAF/IDF into the GPS plan.
To force the planner to set up for certain runways, choose the wind direction and speed in the weather page for both the departure and destination.
Ready made plans:
You can drop a plan from flightaware etc onto IF10 and it will make a route and install the plan and Q400 navdata. Once that's done you need not use IF10 for anything else. But many like the way it starts the sim and monitors the progress.