Reliance Infra, which runs the Delhi Airport Metro line, has refused to operate it beyond June 30, a notice rejected by Delhi Metro Rail Corporation (DMRC) on Friday.Reliance Infra owned Delhi Airport Metro Private Limited (DAMEPL) has written a letter on June 27 expressing its inability to continue operations from the night of June 30.The Board of Directors of DMRC, which met to discuss the matter, concluded that the "notice is in violation of the Concession Agreement and the ongoing arbitration proceedings", an official statement said here.The statement by Sudhir Krishna, Secretary, Urban Development Ministry and Chairman, DMRC, said "the Board decided to reject the notice and call upon them to continue the operations of the line in terms of the Agreement. If, however, they do not do so, DMRC shall step in and operate the line in larger public interest."The Airport Metro line, which is the country's first Public Private Partnership (PPP), has had a tumultuous run beset with controversies after it began operations in February 2011.The services were suspended from July 7, 2012 to January 22, 2013 due to technical problems and after reopening, the speed was cut to 50 km per hour, extending journey time from the airport to New Delhi Railway Station to over 40 minutes, which resulted in a fall in commuters.Sources in Reliance Infra said the decision to shut operations was not new as they had taken up the matter with DMRC a few months ago.The official claimed DMRC could not rectify the structural defects in the Airport Metro line in time and they had to shut down operations for a longer period."We incurred huge losses due to it and after resumption of services, there was a 50 per cent drop in ridership," he said.Asked about DMRC's charge that Reliance Infra has violated the agreement and the arbitration process, the official said they do not agree with such claims.

The high-speed Metro corridor connects the city centre of Connaught Place with the swanky Terminal-3 of the Indira Gandhi International Airport.