As an aside, I had a business encounter and "small talk" discussion with a TSA baggage inspector the other day.

If they (TSA) can "see" fuel in your lighter in your checked bags, they will confiscate it. It no fuel is "visible" (zippo or an opaque bic) they will return it to your bag. They are not allowed to attempt to light it to see if it contains fuel.

Comforting thought that someone making in excess of $100,000 a year came up with this policy. I feel so safe from militant Islamics now.

YMMV