Your parentheses make a good point: we don't know why if the OP was flying from/to the US at all. Other countries have different regulations. I've been allowed

Your parentheses make a good point: we don't know why if the OP was flying from/to the US at all. Other countries have different regulations. I've been allowed to carry a Swiss Army Knife onto a European flight because neither of its two blades was longer than 6 cm. (I've also had a bread knife confiscated because its blade was longer.)