Ive carried on my pins several times through several different airports (LAX, SNA, SLC,and MCO)- Ive always kept them handy as I usually have to show them- Once they see what they are Ive never had a problem with them- If there is a large line at security I seperate them from the rest of my carryon and have them screened seperately so its not a matter of fumble through the bag-
-em