I traveled on a FRA-DFW LH F flight, to be only a few hours in Dallas, and continue with US F DFW-CLT-LGA, and nada zero, nothing KSML. Don't forget that I wasn't allowed to bring food in the USA....
There were some snacks, with one OU D which I don't eat, so that was it...
The purser I wouldn't have accepted her even as cleaning lady by me.