AS told my husband that as long as it emits anything, they won't allow it. Really stupid if you ask me. We spoke to a supervisor who read through the instruction/info manual and even tried it. But still no go, even though it emits water vapor and nothing else.

Her argument is that it looks like a cig, therefore they can't allow it.
Are you allowed to chew tobacco on a plane?

To me it's just a hypocritical position to take. You are allowed other nicotine replacement products, but not this particular one.
Can you get it in a form that does not look like a cig? Maybe bright pink or something, then it won't look as if you are smoking.

I think e-cigs are a great substitute on a long flight! Besides, you do your seat mate a favor by humidifying the dry airplane air a bit.

We also talked to TSA, who said they had no problem with it (this was in SEA, btw).

One word of warning. Hubby bought the package from smokingeverywhere.com. He left it on the charger for a little too long and it smoked out,literally.