flash animation masking

Hi,

Im making a flash banner.

What I want to do is have a paper plane fly across the stage of the flash animation.
When the paper plane flys across and does a loop, I would like it to leave a

- - - - - - - -

behind the plane to show its path it was on, kind of like jet stream if you will.
I guess, id have to use a mask of some kind ??

Does anyone know of a good tutorial for this if you get what I am trying to say. Answering in this forum would turn out to be quite complex Id say, so maybe a similar tutorial would benefit.

thank heaps.

Matt.