It also depends on what country you are flying to. I found out the hard way. My tiny little scissors were fine until I reached Australia. They have their own rules. I had to get out of the security check line, go to the airport Post Office, buy a padded bag and mail them to my daughters home (in Australia). Otherwise they would have confiscated them.
At least I had that option. It cost me $6.50 AU. Money to mail them to her but they were my favorite little scissors and I was going to be using them while there. We do a lot of sewing together. In the USA, TSA rules would have allowed them.