cutting tool

Several months ago, I wanted a serious cutting-device capable of easily handling rope, and ended up buying some 10-inch shears. (more info in this thread) The first sheath I made ended up looking like this, and worked quite well. Features include a 2-inch slot for webbing in the back, a...

I'm assembling a set of gear that fits in a carry-on bag for air travel. No carry on luggage. Any suggestions for a cutting tool that will pass airport security? I already have a pair of EMT scissors with 2" blades, which are ok if I'm reading FAA regs correctly. Has anyone had any trouble...