Design in Flash

Hi - I'm currently working on a flash animation for an upcoming website but I believe someone else might be able to do it a bit more efficiently than I. It's composed of a few simple layers that I want looping at different speeds to create a parallax scrolling effect, but I don't know how to do this without it becoming too time consuming. Overlaying the animation, I'd also like to add a sprite that changes from frame to frame, slowly moving vertically, to build the simulation of flying across the screen. I've attached a few things that will help describe - when its all said and done, it should resemble the first 6 seconds of this video but without the large emblem ([login to view URL]) The video would be 3 and a half - 4 minutes when completed. I have a demo video that I started working on but it's too large to upload to freelancer - if you're interested in seeing it I'd gladly show you. Thanks!