Thank you for your reply, I read the article and did some more reaserch and now i have new different questions.
If I enroll with "Miles & More" can i use it at every purchase i make? does anyone use it here?
Also I noticed that with frequent flyer miles their needs to be empty space on flights and its really hard to get tickets from your points. While with miles & more if I use the Lithuansa there is no problems.. is this true?
Thanks