Image shows concept rendering of 'Overture', a new super-fast aircraft designed by Colorado start-up, Boom Supersonic.

Video. Supersonic and carbon-free: Will we soon be flying 'son of Concorde'?

It hasn’t taken to the skies yet, but the Overture aircraft is designed to trim hours off long-haul flights and avoid harming the environment by using 100 per cent sustainable aviation fuel.