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Last week I flew United Airlines within the US and had no problems with my 10W HID canister light. Going out I had the battery removed, but coming back I just left it in. The screener spent about 30 seconds examining with the x-ray machine, but I was never questioned or asked to remove anything. In my bag I also had my regs, camera, and dive computer.harpstr:Cant find a definitive answer: Will a canister dive light without removable batteries travel on an airline?
Doc Intrepid:This has been mentioned before, but worth repeating...
When you take HID lights or other esoteric dive gear through TSA (either checked luggage or carry-on), you'll generate fewer questions if you take the page from the catalog showing that bit of gear and wrap it around your (light, cannister, strobe, whatever) with a rubber band. Make sure you circle your item, so that any non-diving security weenie who gets skeptical can compare and contrast. A picture is worth a thousand words...