There's probably an easy-peasy solution for this that will produce an instant facepalm, but....

Here's the setup. I've got similar (but not identical) circles drawn on separate planes (parallel here, but not necessarily). I've got a "Loft Line" drawn on an orthogonal plane (the Right plane, in this case).
Name:  loft line.JPG
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I want to align the circles to align their centers (or other points) to the loft line where it intersects the plane the center is drawn on. I see the "Align Sketch" button on the far left, but that doesn't seem to do the trick.

So...what am I missing?

It's for an airplane this time, I swear it. Uhhh, well, a SPACEplane, but it's the same sort of thing....

Ron Wanttaja