Aircraft makers Boeing and Commercial Aircraft Corp of China have launched a joint pilot project to turn used cooking oil into jet fuel. Their plant, based in the southeastern Chinese city of Hangzhou, will be able to convert just under 240,000 litres a year of used cooking oil into fuel, Boeing said in a statement. The project will allow the two aircraft makers to test the viability of producing biofuel using the cheap and widely available form of cooking waste, referred to in China as “gutter oil”.