1.
Secondary Airport. Most of the LCC use secondary airport (not the busiest and high-facility), AirAsia also does it. AirAsia in many countries uses secondary airport, for example; in Malaysia use LCCT instead of KLIA, in Singapore, The Philippines, and Indonesia. Secondary airport is cheaper than bigger major airport and also less dense airport that allow faster turnover for the aircraft. 2.
AirAsia does not offer business lounge for its passenger even for very important people.