Check the TSA website mentioned above, they have the latest rules - I used to be able to fly with my little cutting wheels (blades in a metal sealed medallion, with notches in the edge so I could run thread again a tiny bit of exposed blade - can't remember what they are called). The last time I flew, they were no longer allowed but I could take a small pair of scissors - I printed out the list the day before I left and carried it with me just in case I met up with some cantankerous TSA screener who wanted to make my life miserable. Luckily that didn't happen, but just in case, I wanted to make sure I complied with the most current list of what I could and couldn't carry. BTW, they also allowed me to bring my knitting needles on board, but just to make sure, I took the plastic ones, not the metal ones and was well occupied all the way from Hartford to San Diego!