EVERETT, Washington/WASHINGTON: The Federal Aviation Administration on Tuesday granted final approval to the long-delayed Boeing 737 MAX 10, clearing the way for the US planemaker to begin delivering the largest version of its best-selling aircraft.

Boeing has said the MAX 10 will be a major driver of cash flow in its ongoing financial recovery, following years of crises and controversies that delayed the programme.

Airlines have ordered more than 1,550 MAX 10s, and the model accounts for 31 per cent of Boeing's outstanding 737 backlog, according to aviation analytics consultancy IBA.

The plane is critical to Boeing's fight with Airbus for orders in the lucrative single-aisle jetliner market, with China's COMAC C919 a distant third.