That's not really accurate for the FCL in A. If you start your journey in FRA or come off a schengen flight you only need to go through security once to reach the lounge. To reach a US-bound flight from the A gates you then only need to pass passport control (which usually doesn't have long lines). I was kinda surprised aswell and asked the fraport guys whether this is intent. It apparently is because EU security rules are even stronger than US (except for the shoe screening??)
That must be new because I was surprised that I had no secondary screening when I flew FRA-IAD on UA in early April. In fact the gate was a low number C gate. Before they always had it further down with the Israelis.
In February I flew FRA-LCY (London city) and there was an annoying secondary.
Ok, I was told that this forum holds the secret of F lounge access. Am I supposed to plough through 168 pages.
