I have taken one like that on a plane before with no problem just to see if I could. I also had a spoon and fork with it wrapped in a napkin along with some food in my carry on bag.

At the checkpoint, I just told the TSA guy I had it, showed it to him and he waved me through. The round point and non-sharpened edge complies (at the time) with TSA guidelines. Also in my carry on was a Sterling Superior sharpener.

One of these days, I am going to try to sharpen a butter knife at home to see how long it would take and how sharp I can get it.