The aviation industry has a record of achieving significant environmental improvements in the past decades. Since the beginning of the jet age, reduction of CO2 emissions per seat kilometer has been significant (80%) as aircraft structures, aircraft engines, and aircraft operations have become more fuel efficient. In recent years, this reduction has been, on average, 2.1% per annum. But more must be done to bring the aviation sector in line with the goals formulated in the Paris Agreement (...)