Boeing has delayed work on an ultra long-range jet as the manufacturer continues to deal with the 737 Max crisis.

Boeing said: “We reviewed our development schedule and the needs of our current 777X customers and decided to adjust the schedule.”

It said it remained committed to building the aircraft and said the delay would reduce risks to the programme.

Boeing did not name the specific areas of the 777X’s development that had been delayed.

It is understood that delays during testing of the first model in the series – the 777-9, which was due to launch next year, prompted the decision to push the delivery of the 777-8.

Boeing is in the midst of trying to rebuild its reputation after two fatal crashes involving its 737 Max aircraft.

The 737 Max aircraft remains grounded following the two crashes which killed 346 passengers and crew.