I've only flown once since 9/11, and since tomorrow is my second flight (to WDW of course!), I decided to check on this question. I went to the airport website and accessed the list of items prohibited in airplane cabins. Curling irons, hair dryers, or anything along those lines, were NOT on the list. So, after reading this, I would feel fine about bringing one in my carry on luggage. But, if you still have doubts, just call the #800 for the airline you are using.