Maybe I can assist you.
When you created the animation, did you correctly follow the Tutorial (i.e.: gaps, distances, etc.)?
Also, is that me or the jetway model is very big when looking at the scene?
I remember I had the same issue when I was being curious and started following the SODE Jetway Creation Tutorial. At first it was the same result as yours, but after some minor tweaks to the parameters, I could finally get it working as expected.