I had an interesting one with Delta when flying to LAX. They wanted me to remove the battery from my dive computer. I explained to them it wouldnt turn on unless in water, was a manafacturer sealed unit and there was no way I was going to ruin an £800 computer!! Eventually one of the ground crew who was a diver showed up and explained to his mates its was OK!!
Pony bottle are normally a problem and removing pillar valves seems to be a standard request from airlines.
The only other problem I have heard of, if anyone decides to go by Eurostar(not an aircraft I know
), but they confiscate divers knives!!
Julian
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Live fast..dies young...leave a good looking corpse!