Originally Posted by
bigintangibles
Aegean Airlines, which is a member of Star Alliance, has a very low threshold for Gold status, which is of course matched across *A. It takes just 4,000 miles to reach silver, and 20,000 miles to reach gold. In addition, Aegean Airlines are currently providing 2,000 miles as an online sign-up bonus, so all you need are 18,000 miles. The Aegean forum on FlyerTalk also reports that once you reach Gold on A3, it is valid for 3 years.
That way, you are able to reach CX Diamond + *A Gold, assuming your travel is interchangeable in this way.
Just don't count on the 3 year/lifetime Aegean status, or your mileage balance, in the medium/long-term as there's a higher chance of them going bust than the bigger *A carriers.