Originally Posted by
Punki
... Lufthansa I know has a Senators lounge, which I am assuming is free to all Senators. ...
correct, entrance even ok when arriving (can use it as an arrival lounge, but in most places, like ZRH, only if I don't have to get checked luggage after arrival, as most of these lounges are situated in either secure areas (in Germany) or before immigration/luggage pick-up (ZRH, GVA).
LH's own business lounges are also free for all departing costumers with miles&more-FrequentFlier status (miles&more Star-silver status).