Best of my knowlege, yes you can. I have flown a few times for work (god knows you can't make me for "leisure", too fustrating) and never had a problem with my multi-tool du jour or pocket knife I want to clip to my pocket when I get there. However I MUST stress be aware of the knife laws of where you are flying to! Here in Florida I have no problem carring a 4" bladed floder, when I went to Chicago according to the research I did I could only carry up to a 3" bladed knife so I had to choose a different one from what I normally carry.

-Bill Liptak