Trial runs have begun on the Dwarka Sector 21-IICC metro section on the Airport Express Line, officials here said on Sunday. The segment between Dwarka Sector 21 and the upcoming India International Convention Centre (IICC) is expected to be commissioned by July, DMRC chief Vikas Kumar had said on May 3. Dwarka Sector 25 (IICC) is an underground station and an extension of the presently operational Airport Express Line connecting the New Delhi Railway station with Dwarka Sector 21 via terminal 3 of the Indira Gandhi International Airport.