Ok, thanks for the responses here. I think its generally good to know that no one (here at least) has had there PFDs (or really, the CO2 cartridges) taken from them with supporting TSA documents. Not taking and just buying cartridges in BVIs is not something I want to do - hassle to arrange at best assuming I could find specific cartridges, and just more expense/waste. Clearly there are people that carry on and others that check as baggage. I'm waivering on what I will do, but generally hopeful that either track will get my stuff to me (hopefully)...Thanks for the responses/thoughts!