Originally Posted by
worldclubber
They do it for any LH Group flight in F, including the LX 777.
I think I've gotten it maybe 50% of my LH-group F flights. Got the escort to lounge a few times (NRT, ORD) but also didn't get it from LON, BUD, SFO. Probably they only do it when your first segment is in F, not when you're connecting to F.