Delhi International Airport Limited (DIAL) will spend more than Rs 9,500 crore to almost double the capacity of the airport in the next three years. Infrastructure major Larsen & Toubro (L&T) has won the contract and entrusted with the entire engineering, procurement and construction (EPC) work.Codenamed Phase 3A, the infrastructure expansion would include the construction of a fourth runway, expansion of T1 apron area, and development of dual elevated Eastern Cross Taxiway, said I Prabhakara Rao, deputy managing director, GMR Group, which holds 54 per cent state in DIAL. The project also includes expansion of T3.