Boom Supersonic has revealed growth in orders to 76 aircraft from five airlines.

The manufacturer, which believes it can bring supersonic commercial flights back to the skies by 2023, also revealed a new design for its XB-1 Supersonic Demonstrator jet at Pars Air Show.

Boom had previously announced that Virgin had ordered ten of the new jets, but the other four airlines remain a mystery.

"Airlines are excited for something new and different to offer their passengers - and we're thrilled that major world airlines share our vision for a future of faster, more accessible supersonic travel," Blake Scholl, Boom's founder and chief executive, said at the show.

Boom’s vision is to make supersonic travel both affordable and sustainable for airlines – a marriage Concorde never successfully achieved.

Talking to Routesonline earlier in 2017 ahead of Scholl’s speech at Routes Americas, he said the jet would target 500 routes which “have enough traffic for supersonic service and the opportunity for meaningful speedup”.

“Our ultimate goal is affordable supersonic travel for everyone,” he said. “We’re starting with a 45-seat aircraft with business class economics, but this is just the beginning.”

Read the full interview with Blake Scholl from January 2017.