I have the TSA-safe keyring Leatherman as part of my flying EDC. When I put my keyring in my bag the TSA pays no attention to it. The nail clippers have worked for me as an awkward knife when I've needed them to.

When I fly, mostly I don't check bags. That means I leave behind my pre-'04 LM Wave, silent ratcheting screwdriver, small screwdriver, and widgy bar, all of which normally ride in my laptop bag. I do not enjoy that.