[knotscott]

I think the key to accurate edge jointing using any method (jointer, router, TS) is getting a flat reference face to start with. If the face isn't flat, it's hard to ensure that the jointed edge is a true 90° to the face.

A jointer is the easiest and most effective way to flatten a face, but a planer can do it with the help of a planer sled...you can also use a hand plane, drum sander, or a router with a jig as shown in the video. I suspect it'd take a good long time to flatten a large board using the router.