Originally Posted by
NWIFlyer
Whilst TK is the easiest short term option, you might want to consider the relative difficulty in renewing if your longer-term plans involve a reasonable amount of *A flights. A3 with four segments and 12k is easier than TK in that respect, given earnings are similar.
Not to mention that if you do a lot of *A flights in a particular year, you can also renew A3*G with 24K miles and 0 segments...