I would think that it was custom, or modified based on another font. The most similar I could find are:

Mildred Fancy
Gf Script No 5

These are obviously not the same fonts, but hopefully will help a little.

considering you're talking about Nike here, i'd very much doubt it is something commercial. i've seen a version of the logo you provided in flat form, like a ribbon or folded piece of paper. betting heavily that they did some major modifications starting with a basic font and trailing the characters together.

edit: so my suggestion would be, strip out the connections and get down to the base letters.

re-edit: not that i'd suggest you forge the logo. i'm hoping you just want a similar effect.

yes, I want something similar, but I am clueless on typography design.
I found this- look at the bottom font "you know and a day", it looks similar but can't ID it.

http://www.myfonts.com/fonts/suomi/cider/script/