The Indian government’s biggest defence acquisition of 126 medium multi-role combat aircraft (MMRCA) from French defence major Dassault Aviation could be delayed as the both parties are yet to decide the role of state-owned Hindustan Aeronautics Limited (HAL). Sources said that the French company ‘wants separate contracts’ for aircraft (Rafale) made by the company and another for units built by the Bangalore-based public sector aviation company.