There are 449 airports / airstrips in the country. Active among them are 92 airports and 28 civil enclaves at defence airfields which provides air traffic services over the entire Indian airspace and adjoining oceanic areas. Currently the various Airlines are utilizing only 61 Airports. This means that there is still a huge market to be tapped in the Civil Aviation Services Sector. 
 
The Airports in India are presently classified in the following manner: 

1. International Airports: These are declared as international airports and are available for scheduled international operations by Indian and foreign carriers. Mumbai (Bombay), Delhi, Chennai (Madras), Kolkotta (Calcutta) Kochi (Cochin) and Thiruvananthapuram (Trivandrum) are in this category. 

2. Custom Airports: These have customs and immigration facilities for limited international operations by national carriers and for foreign tourist and cargo charter flights. These include Bangalore, Hyderabad, Ahmedabad, Calicut, Cochin, Goa, Varanasi, Patna, Agra, Jaipur, Amritsar and Tiruchirapally.

3. Model Airports: These are domestic airports which have minimum runway length of 7500 feet and adequate terminal capacity to handle Airbus 320 type of aircraft. These can cater to limited international traffic, if required. These include Lucknow, Bhubaneshwar, Guwahati, Nagpur, Vadodara, Coimbatore, Imphal and Indore. 

4. Other Domestic Airports: All other airports are covered in this category. 

5. Civil Enclaves in Defence Airport: There are 28 civil enclaves in Defence airfields.