as funny as it may sound, if I was going to take something on the plane I was not supose too( rather it be for harm or just transporting something) I'd most likly hide it in something that would be over looked, baked goods would clearly be a good choice.
Thats not to say I agree with them, Devils advocate and all.
Terrorist have very smart people working for them, they do nothing but think of ways to do bad things.