The transaction envisages NIIF making a primary investment of Rs631 crore in the form of Compulsory Convertible Debenture (CCD) in GMR Goa International Airport Limited (GGIAL), a special purpose vehicle to run and operate the New Goa Airport. Under the agreement, NIIF will invest in the equity capital of three airport projects. These include the greenfield international airports at Mopa, Goa and Bhogapuram, Andhra Pradesh, said a press statement.