The solution is simple. I'm sorry no one has answered your question yet!
1) If you right click your plane layer. You will see an option "Convert to symbol."
2) If you click "convert to symbol" you will get a pop-up asking you to name the symbol. Name it anything you like! Example: planeSymbol.
Info: What this does is MOVE your layer/object into its own timeline. Since your mouse move only effects the MAIN timeline.
If you want to edit the timeline for your new planeSymbol. Right click the layer and select "edit symbol_name" or "edit planeSymbol". Here you can make any modifications to that objects animation.
Extra: If you ever wana refer a specific obect within a symbol you have to know the path: sym.getComposition().getStage().getSymbol("symbolName").play();
Hope that helps!
Thanks so much, PortalPacific! It's late, but I'll definitely try it tomorrow!
PortalPacific, I have, as you instructed, made my plane into a symbol and set it up to move from offscreen on the left to off the right side off the screen. However, if the mouse is moved, it still responds by streaking backwards and forwards across the screen. Is there any way to tell it to IGNORE the mouseMove script that's applied to the stage?
What's so the code you are using? Or even better.. Can you upload your files so I can take a look?