HONG KONG, March 27 - China has stationed obsolete supersonic fighters converted to attack drones at six air bases close to the Taiwan Strait, according to a new report by the Mitchell Institute for Aerospace Studies.Satellite imagery of these airfields from the February report, “China Airpower Tracker,” shows what appear to be lines of stubby, swept-winged aircraft matching the shape of J-6 fighters that first flew with the Chinese air force in the 1960s. Since their conversion to drones, these aircraft have been identified at five bases in Fujian Province and one in Guangdong Province, according to the report from...