This is just something my rogue buddy and I discovered after hijacking a zeppelin. While in flight, if you run onto the handrail... thingy...
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...on the left as you go down into the belly of the zeppelin, it will fling you backward, out of the zeppelin, and you will be left hovering in midair. This does not cancel until you move/jump/etc. In the meantime you can sit, lay, or even...
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BE WARNED! You do not always stop in midair. I'm sure you can guess what that means...
*splat*
But hey, make sure you're naked when you do it and there's not much to worry about even if you do die. And keep in mind that if the guards shoot at you through the Zeppelin and you die (for Alliance only, of course), just sit there dead and wait it out. When the Zeppelin changes continents, you'll be rezzed good as new.
I'm not sure what you plan to do with this information but make it good! I want screenies!
P.S. - The right spot on the zeppelin is kind of hard to hit, but once you find it, you should be set. Keep playing around with it til you find it.
P.P.S. - Assuming you successfully get on the boat, find the right spot, get ejected out of the zeppelin, and manage to land safely in midair, make sure you have a way down. Again, nudity can save you repairs here, but definitely not embarassment.