How are slots allotted to airlines for operation form an Airport?

With the increase in air traffic at the major airports in the country, the capacity of many airports has been constrained. Therefore to ensure most efficient use use of airport infrastructure and in order to maximise the benefits to the greatest number of airport users, the Airport Authority of India (AAI) has a policy for allocation of constrained or limited airport capacity to airlines and other aircraft operators, through a transparent and equitable mechanism so as to ensure viable airport and air transport operations.