Watering a plant (from the top of the soil) creates a suction, which draws air (oxygen) down to the roots. If you are not getting enough air, or are having problems with lower root zone always wet, either you can drill those holes in the sides, or add more perlite to the soil prior to potting, or both.

Additional air being pumped into the soil will create extremely low humidity air pockets, and roots will die. (like having a blow dryer on, inside your pot) Altho there are some good applications for air pruning, I'm just not one to stress my ladies like that.