@Melonlity -- probably not, but you can't be too careful. It all depends on whether the airport in question uses a metal detector or an x-ray machine to scan items before they are allowed through security. An x-ray machine will not harm your flash drive because it is not magnetic. A metal detector, which is often magnetic, will.
It is well nigh impossible to determine which airports have what as you are traveling, although the majority of them have x-ray machines. To be perfectly safe, you might want to check with the manufacturer of the Swiss Army USB. There are a lot of variations on the "Swiss Army USB" theme, and some manufacturers claim they have products that will protect against magnetic damage.