On the subject of prhibited items:
About 10 years ago I was going on a sailing trip and brought with me my safety harness/life jacket. It had a CO2 cartridge that was not allowed on the plane by security at YYZ. It was because it was comressed gas. Now doesn't every seat in a modern a/c have a life jacket with 2 CO2 cartridges? Where is the danger? I can se that in post 9/11 days it could contain some other substance etc. but in those days they were only concerned with compressed gas.
Can anyone comment?