HYDERABAD: Union Minister for Tourism and Culture G Kishan Reddy on Wednesday urged Chief Minister K Chandrasekhar Rao to cooperate with the Centre in establishing greenfield airports in Adilabad, Jakranpally and Warangal. In yet another letter to the chief minister, Kishan Reddy alleged that the State government was not responding to the earlier letters written by him and the Centre in this regard. He stated that the Airport Authority of India has conducted the OLS survey and soil testing, and also a techno economic feasibility study, after which permission was accorded for establishing these three airports.