"Given how sharply the number of flights has to decrease, the difficult question then is who gets to fly, and for what purpose. Should priority be given to someone taking their fourth flight this year to their second home in the Mediterranean, or to someone visiting their family living abroad? A first step might be to increase taxes in line with the number of flights a person takes, with what’s called a frequent flyer levy." But that’s not enough. Price mechanisms can’t make the value judgements at the heart of this – and they could just make flying exclusive to a rich elite who could still afford it. It seems more appropriate to make these decisions through democratic deliberation processes like citizens’ assemblies. Deep and rapid changes to the world’s transport systems are needed to halt climate change, and many of these would also improve human well-being and public life. But to get there involves challenging powerful vested interests in aviation and the car and oil industries.