The different terminals of the IGI airport will soon get dedicated metro connectivity for passengers to transit from one terminal to another. Delhi International Airport Pvt. Ltd (DIAL) has proposed an automated people mover (APM) between terminal 1 (low cost domestic), T2 (old international, which will make way for a new T4 in 2020), and T3. Based on that, the plan is to have four stations for its air train at T1, Aerocity (the hospitality district), cargo terminal and a common one for T3 and T2/4 at an investment of Rs. 2,000cr. As per initial estimates, the line will be 5.5 km-long with 3 km underground section and 2.5km on ground, whereby, the average costing of each km of under and on ground metro line is upto Rs. 500-cr and Rs. 200cr, respectively. However, factually picture on this score will be known once DMRC gives its report to DIAL, said the source.