I've got a duet of works where Jet appears...
The first is Jetara specific, entitled Speakeasy. COMPLETE! AU. What if the 'Jet' episode was set in the Roaring Twenties? Think jazz, gangsters, and flapper dresses. I'm kind of looking for an editor for it, if anyone is looking to take on a small project. Find it on fanfiction.net
And the other, while mainly featuring Zutara (with one Jetara scene), basically answers the question, what would happen if you mashed ATLA and Pirates? Check out Rough Seas, complete with Captain Jet - yo ho mateys!