A Rolls Royce jet engine is seen on Boeing 787-10 on the static display during the 52nd Paris Air Show at Le Bourget Airport near Paris, France June 20, 2017. REUTERS/Pascal Rossignol

DUBAI (Reuters) - Boeing BA.N is close to a deal to sell around 40 of its 787-10 passenger jets to Dubai's Emirates, sources familiar with the matter told Reuters on Sunday.

The deal, which may be announced as early as this week’s Dubai Airshow, could be worth some $12.5 billion at list prices, the sources said, asking not to be identified.

Boeing BA.N and Emirates declined comment.