ActionScript 3.0 :: Reference A Specific Frame Inside A MC In .swf File?

I'm trying to reference a specific frame inside a MC in my .swf file from an .as file.What I want is to capture the current frame of the movie clip for the .as file. It's for the purpose of points when you shoot each plane. It's an easy trick of frame 1's plane would be worth 100 points, frame 2's plane 200 points, etc.I thought I'd write a line like this in my collision detection section of my .as file.

Code:
planePoints = currentFrame * 100;

The only problem is, of course, it grabs the current frame of the main .swf timeline that my flash file uses, and not the movieclip that's being called to produce the planes.So I thought I'd be able to specify a path to the movie clip (in this case it's called Airplane in the MC's linkage properties)

Code:
planePoints = Airplane.currentFrame * 100;
Then, of course, it freaks out and says that 'access of possibly undefined property currentFrame through a reference with static type Class.'

I still get confused with AS3 and the way items are handled vs AS2. I've lost track of how many times I type _root.