Not only are they gorgeous, quiet, and great for slippery projects, but I flew from the US to Italy and back with my palindrome scarf OTN in my carry-on. No one batted an eye. :woohoo::woot:
I have successfully flown many times domestically with my KP options, but I had heard that international flights could pose more of a problem.
A colleague traveling with me had to give up a silver hair stick that was much smaller than my needles. They would have taken my metal options for sure.