Like what everyone has mentioned before, as the loyalty program is very popular (due to the lower amount of miles required to fly compared to other programs out there), you really need to book way in advance especially for business class.I've booked my Chinese New Year 2018 flights in mid Februar...

I've been able to book seats 3 years in a row now. I usually use my Asia Miles for flying to Malaysia/HK for Chinese New Year and I haven't had any problems with booking seats to fly during that busy period.