Dublin-based aircraft leasing company Avolon has signed a deal to buy 100 new Airbus planes with a list price of $11.5 billion.
The Avolon order consists of 75 A320neo jets and 25 of the larger A321neos.
The new planes will be delivered between 2023 and 2026.
Today's deal means that Avolon is now Airbus's largest aircraft lessor backlog customer.
Avolon CEO Dómhnal Slattery said the new orders builds on the company's leading industry position.
"We are locking in growth well into the next decade and building on our existing order book of exclusively new technology aircraft," Mr Slattery said.
The Avolon chief executive said the company continues to see robust demand from its customers for the A320neo family.
"This is consistent with our own market research and global fleet forecast. Our order affirms our belief in the medium-term market outlook and the strong growth prospects for our business," he added.
Christian Scherer, Airbus Chief Commercial Officer, said the Avolon order underscores the market appetite for the efficiency, reliability and passenger appeal of the A320neo family.
HNA, owned by Chinese company Bohai, holds 70% of Avolon, with Japanese firm Orix Aviation Systems owning the remainder.