We've carried PFDs with CO2 cartridges on many trips, most recently a few weeks ago when we packed them in our carry-on bags. I vaguely remember one time years ago an agent raised questions about them, but ultimately let them through.

By the way, we bring belt-pack style PFDs, and do indeed wear them when we leave the security of the cockpit and go up on deck. I believe that many people who think of themselves as swimmers would expend a lot of energy staying afloat and might be in serious trouble if it took a while to maneuver the boat back and get them aboard. I'd rather not find out.

Dan <img src="http://www.traveltalkonline.com/forums/images/graemlins/Cheers.gif" alt="" />