Aerospace giant Pratt & Whitney signed a memorandum of understanding with sustainable aviation fuel (SAF) producer Air bp to use blends of up to 100 percent SAF on upcoming engine tests and research, a press statement reveals. The agreement comes shortly after the aviation industry set a goal of reaching net-zero carbon emissions by 2050. Other large aviation firms are also showing a commitment to testing and using SAFs. Earlier this month, Airbus flew one of its double-decker A380 airliners using 100 percent SAF derived mainly from cooking oil.