I was flying from Austria to Switzerland and I was carrying a BM 550HG. Right before checking my bag I opened the zipper a little and slipped the Griptilian in there. When I arrive in Switzerland the Griptilian wasn't there! 
I still had 2 weeks left in the trip, but luckily I had taken a backup knife; Leatherman c33. That one only lasted 2 days since I forgot to take it out of my backpack and into my checked luggage. It was taken by security on the next flight I had.
I didn't care about the Leatherman since it was my fault for forgetting to put it in my luggage, but the 550HG was one of my most carried knives
On a good note, I flew with a Leatherman Ps4 and out of 6 flights was only asked twice to show it, and once they suggested not to take it on the plane for my next flight.

I still had 2 weeks left in the trip, but luckily I had taken a backup knife; Leatherman c33. That one only lasted 2 days since I forgot to take it out of my backpack and into my checked luggage. It was taken by security on the next flight I had.
I didn't care about the Leatherman since it was my fault for forgetting to put it in my luggage, but the 550HG was one of my most carried knives

On a good note, I flew with a Leatherman Ps4 and out of 6 flights was only asked twice to show it, and once they suggested not to take it on the plane for my next flight.