It's been a very long time but finally, I have a new instructional video on my YouTube channel:
Lucky #13, as it turns out. I shot it a long time ago but I still look the same and I still teach glissade the same way. Almost! If I were to re-do this one, I might add the suggestion that you spring your toes from the "push" leg, that is the second leg in the glissade. This will help to get you more suspension and allow you to stay in the air longer.
Enjoy! And happy dancing~