I went to Dan McEntee's and he loaned me an OS FP40. I left it in my carry-on roller-bag and went through security about five times. Never had one guy say one thing.
A few years back, I carried two PA 61's back from St. Louis and the young x-ray scanner person wanted to see what they were. I told him they were model airplane engines and he wanted to see them anyway. He took them out and looked them over, and then asked again, "...what are they?". His supervisor repeated that, "...the man told you, they are model airplane engines." Our scanner person didn't have any knowledge of such a thing, and questioned in this manner, "How do I know that's what they are?" His supervisor finally told him that if he didn't know before, he knows now that objects like that are model airplane engines, and to let me go.
It all depends on the individual, there are no "standards" as such, each airport has it's own rules. With the Fed running the TSA, and the PR stunt aspect of security at airports, we will always be suspect.
Glad you made it, Randy.
Chris...