Boeing’s chief executive has vowed there will not be another accident related to the flight control software that has been implicated in two deadly crashes of its 737 Max aircraft, while admitting its communications were unsatisfactory during the crisis.

Addressing the media on the eve of the Paris Air Show and for only the second time since the second crash of the 737 Max in March, Dennis Muilenburg said he was “very confident there will not be another [MCAS-related] accident”. He was referring to the faulty manoeuvring characteristics augmentation system that played a role in both crashes.

Boeing has thrown its weight behind resolving the crisis, said Mr Muilenburg, stressing that the “accidents continue to weigh heavily on us”. They were “something we will never forget,” he said. Boeing, he added, had work to do “to re-earn the public’s trust”.