Boeing 777X.

World’s largest twin-engine jet completes first flight

It comes as the firm attempts to boost its image after its 737 Max plane was grounded last year following two fatal crashes that killed 346 people.

The flight took off near Seattle and lasted four hours. Two attempts were called off this week due to high winds.

Further tests are needed before the aircraft enters service with Emirates next year.

The 252-foot-long passenger plane had been due to launch this year but has been delayed by some technical difficulties.