Hemmerdinger, Jon. "Ethiopian commits to purchase eight Boeing 777-9s". Flight Global, March 5, 2024. Quote: "Boeing and Ethiopian Airlines announced today an agreement... to purchase eight 777-9 passenger airplanes..."
Robert Wall, Jon Ostrower and Rory Jones (July 15, 2014). "Aircraft Makers Narrow Engine Options". Wall Street Journal. Archived from the original on October 23, 2017. Retrieved October 23, 2017.
"Document 8643". ICAO. September 13, 2019. Archived from the original on June 7, 2017. Retrieved September 21, 2019.
wsj.com
Robert Wall, Jon Ostrower and Rory Jones (July 15, 2014). "Aircraft Makers Narrow Engine Options". Wall Street Journal. Archived from the original on October 23, 2017. Retrieved October 23, 2017.