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When I go away for family vacation, I bring a Double Arrow. They take a nice edge, and all you need is a travel strop to keep it sharp for a few weeks. I know the edge doesn't last as long as that...

While tha tis surely the safer assumption to minimize hassle, here is what I pulled of TSA's website:

Prohibited:
Razor-Type Blades - such as box cutters, utility knives, razor blades not in a...

If I absolutely have to travel without a straight (ugh!) I use a DE, and do as the poster above said, the blade is loaded in the Razor. I have probably done this 30 times in the past 5 years, and...