NASA’s X-66A Sustainable Flight Demonstrator Project: In a groundbreaking partnership, the US defence and aerospace company RTX has been selected by Boeing to collaborate on the X-66A flight demonstrator as part of NASA's Sustainable Flight Demonstrator project. This initiative is dedicated to achieving net-zero CO2 emissions for commercial aviation. With the support of RTX business units Pratt & Whitney and Collins Aerospace, Boeing aims to develop the next-generation single-aisle aircraft with improved fuel efficiency and reduced emissions.