Aegean Miles+Bonus has a Black Friday promotion. You will receive 6000 award miles AND 1000 tier miles just for signing up to their system.
Just go their website and register.
I have received the miles directly:
There is another Black Friday promo with Aegean.
Get 60% off for flight to Greece and receive 6x award miles!
Anyway Aegean Miles+Bonus is one of the easiest way to get Star Alliance Gold and they offer directy flights between Athen and Luxembourg.
To achieve Gold, you must first achieve Silver. The miles earned for Silver do not count for Gold.
How to get Gold status:
– reach Silver: 12000 tier miles AND 2 with Aegean or Olympic Air flights OR 24000 tier miles
– reach Gold: additionally you need to flight for extra 24000 tier miles AND 4 flights with Aegean or Olympic Air flights OR 48000 tier miles
To retain Gold:
– you need 12000 tier miles AND 4 flights with Aegean or Olympic Air
– you need 24000 tier miles
This promotion has ended, maybe it will come back next year