This is why the Dark Knight flies in his own personal Batplane.
The Transportation Security Administration confiscated four batarangs (interestingly, in two different styles) from a passenger at Boise Airport in Idaho, along with an array of other interesting items from passengers across the country, according to the official TSA Blog.
We'd wonder why the passenger figured batarangs were acceptable carry-on property, but then again, other items confiscated at U.S. airports last week included way too many firearms (some loaded with rounds chambered!), multiple stun gun, several knives, what appears to be some sort of throwing glaive, and a full-sized meat slicer. So what do we know?