Regulators across the world have been assessing changes made to the MAX and its anti-stall software, after the plane was grounded in March 2019 following two crashes which killed a total of 346 people.

Britain's Civil Aviation Authority (CAA) lifted the ban on the MAX, making its first significant aviation safety decision since formally leaving the European Union and the EU Aviation Safety Agency (EASA), on Dec. 31.

(Reporting by Sarah Young. Editing by Andrew MacAskill)