Aircraft jet ai in standard assets example project

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hello.. i am using unity's AI scripts in the standardAssestsExampleProject, mainly the - waypoint progress tracker , aircraftjetAi and waypoint circuit... the scripts handle the movement of the aircraft really very well and "realistically".. but i cant understand how the scripts work, they are too complicated.. it would be great if somebody could describe the algorithm behind waypoint circuit script and waypointprogresstracker script... please help.