The aircraft, which are worth $8.8 billion at list price, will be delivered from 2023 for five years. 

A purchase agreement signed at the aerospace event allows Emirates to substitute B777xs with B787s.

The deal was signed by Sheikh Ahmed bin Saeed Al Maktoum, Emirates chairman and chief executive, and Stanley Deal, president and chief executive for Boeing Commercial Airplanes. 

“This is an important investment and addition to our future fleet and network requirements, providing us with the agility, flexibility and spread of seat segments when it comes to overall capacity to serve a range of destinations as we develop and grow our global route network,” Al Maktoum said.

He also reaffirmed Emirates’ commitment to its B777x programme. 

Added onto a $16 billion Airbus A350 order signed on Monday, the total value of Emirates’ aircraft commitments at the 2019 Dubai Airshow is now $24.8 billion.

Deal added: “We are excited to finalise this important order from one of the world’s leading airlines.

“Our agreement solidifies Emirates’ plan to operate the 787 Dreamliner and the 777X, which make up the most efficient and most capable wide-body combination in the industry.”

Emirates is the largest Boeing 777 operator, with 155 777s in service.