its been years since i did that but i used AI flight planner ( freeware ), loaded the stock traffic bgl in to it and then i believe i exported it to a spreadsheet app then went through the flight plans.

you can find the stock traffic files Flight Simulator X\Scenery\World\Scenery.

Since i use UT2 for ai traffic i dont use the stock traffic file any more.

forgot to say, the stock traffic file is called trafficAircraft but if you are going to make changes back it up first.