It's all in your attitude. If you don't reek of weed, and you are acting like a non-stoner, and you don't wear a shirt with pot leaves on it, you will be fine to smuggle some weed on the plane in your pocket, but don't carry a pipe on your person. Pack the pipe in your checked baggage and put it in between some clothes so that it is in the middle of the bag.
Also: don't try to smoke anything on the plane. They WILL catch you, they WILL have local police waiting at your destination at which point you WILL be interrogated, arrested (federal offense), and likely ass-raped. Smoking on plane = bad idea