Every single time i go on a plane i bring weed with me.
Usually tape it to my leg or put it in my bags..not carry on.
Have not had one problem with it but im usually pretty careful.
I just got back from jamaica and got through customs with a gram of jamaican hash and a 1/4 of bud. And this is coming back into the country where security is tighter.
But i prolly have had 30 successful trips with bringing weed on the plane.