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assumption, that you have confused wac to events editor
However, your models behaviour is suggesting that it is unable to locate the next waypoint, right click the item attributes and increase the circle from the default 10m to about 25m, in some examples I use 55m-75m
keep the waypoints close 100-200m apart depending on speed, ensure your models go to red alert and maintain that state
with aircraft you need to keep an eye on the waypoints horizontlly, so it takes off and lands like steps of 20m or so.