The airline industry's flagship goal of decarbonising by 2050 is now "in peril" due to climate-sceptic policies, including those of US President Donald Trump, the leading airline association IATA warned on Sunday.

The emergence of leaders favouring fossil fuels and recent regulatory rollbacks are "obviously a setback... it does imperil success on the 2050 horizon", Marie Owens Thomsen, the International Air Transport Association's senior vice president for sustainability, told reporters.