i have the iwata hp-c.
i built mostly robotic resin kits so i'm not really sure about a plane or a car.
this airbrush has served its purpose for the most part.
but i have no clue as to how anyone can do panel lines with these. i mean, it won't give a fine hair line type of mark. it can give a pretty thin line though but not sure if it's to your liking.
i don't draw lines with these only paint the overall surface.
if i want the paint to come out to cover a larger surface area, i just slide the airbrush needle back a little to create a larger hole and the paint comes out more largely. covering a larger surface.
i've heard that it's not the best airbrush out there. but i don't know much about an airbrush so i can't really say specifically.
but the hp-c is pretty good for an overall ground of work.
just make sure that the airbrush compressor is as good as the airbrush. not get a cheap one that can't even adjust the psi pressure.