Out of all means of transport, the aeroplane is the biggest polluter, by a long chalk. It is the source of greenhouse gas emissions that has seen the steepest growth curve in Europe over the last few decades. Consumers are starting to wake up to this fact, as concern over the speed at which the planet is warming up spreads; the youth marches of 2019 and the international platform granted to Greta Thunberg are testament to this. Long before the COVID-19 pandemic, the Scandinavian countries,...