Boeing (BA) won a key approval from China's aviation regulator, bringing the Dow Jones aerospace giant one step closer to resuming 737 Max deliveries in the country. BA stock rose modestly early Thursday.X Boeing still needs approval from China's National Development and Reform Commission to begin 737 Max jet deliveries to individual airlines, according to the report from trade publication Air Current.China Southern Airlines has apparently conducted a 737 Max testing flight, Deutsche Bank analyst Scott Deus ...