AI move to location without navmesh

Hi,
I am trying to make an flying AI (Airplaine) and have already calculated the route it has to take, but i cant make it to follow these points. I have already changed my Pawn to DefaultPawn, which atleast stopped chrashing the Editor when calling the"Move To" function from the behavior tree was called. However, I cant make my Pawn to move…
Is it possible to use this function without a navmesh?
And/Or are there simular functions i could use?

However, I have written my own move function in c++ now

Could you please tell about mechanic of your function?