The Airports Authority of India (AAI) has signed three concession agreements with Adani Enterprises for operations, management and development of Ahmedabad, Lucknow and Mangaluru airports. The concessionaires are required to take-over the three airports after fulfilling certain conditions precedents within 180 days from February 14 and will operate, manage and develop the airports for the next 50 years, in accordance with the terms and conditions specified in the Concession Agreements.