Singapore Airlines has picked the Rolls-Royce Trent 1000 engine to power its future Boeing 787-10X aircraft.
The 30 new planes are slated to be delivered from the 2018/19 financial year.
SIA said in an announcement on Friday that the engine was selected from among two competing models.
The airline has also signed a letter of intent with Rolls-Royce for engine maintenance, repair and overhaul services, as well as spare engine support.
SIA's decision follows a recent deal with Boeing for the purchase of the jets.
The order is conditional upon Boeing formally launching the B787-10X programme.