Originally Posted by wyvern

Aegean (A3), which offers low *G threshold, unlimited miles validity if you credit every year or two, one-way awards, and award bookings changeable up to the day of flight for a small fee.

Asiana (OZ), which will take miles transfer from SPG and has a 500K mile lifetime *G - sadly they don't seem to do status matching at all, also their miles expire after a fixed period.