Refer to the input text as context and select the correct relationship between 'A350' and 'British Airways' from the available options.
Options: operator, business division, platform, chairperson

British Airways declined to specify how long the upgrade will prolong the 747's lifespan, though it has said the bigger 787 variants and Airbus's largest A350 will be used to phase out some jumbos through 2023.
operator