GoodWay is the main software for generating flight plans for X-Plane. Imagine you have to travel, without road signs, without a compass, without a map even without a path.
GoodWay is your map. It uses all of the navaids and the airports of X-Plane. It allows you to create your own fight plan or it can generate one for you automatically. Just select your departure and arrival airports and GoodWay will create the flight plan for you, and will even put you at the commands of the aircraft.