Originally Posted by
GBobon
aegean is 12k + 4 x A3 or Olympic flights and you can buy tier points as well, if needed

12k plus four a3 flights is for gold
retention. To get to gold with a3 flights, you need to get to silver first, with 12k miles and two a3 flights in 12 months, and then 24k miles plus four a3 flights in 12 months to get up to gold. With no a3 flights, it's 24k to silver and then 48k to gold.
TK is easier to get to gold with no need for (TK) flights, but their award miles expire. A3 award miles don't expire.