Vietnam’s VietJet Air and CFM International have finalized an agreement for the airline to purchase 200 LEAP-1B engines to power 100 additional Boeing 737 MAX airplanes announced earlier, along with an extension of airline’s current Rate Per Flight Hour (RPFH) agreement to include the new engines. The agreement, which includes 15 spare engines, is valued at $5.3 billion U.S.

The signature ceremony was witnessed by U.S. President Donald Trump and Vietnam party chief and President Nguyen Phu Trong in Hanoi, Vietnam, on February 27.

RPFH agreements are part of CFM’s portfolio of flexible aftermarket support offerings. Throughout the term of the 12-year agreement, CFM guarantees maintenance costs for the 415 VietJet Air’s LEAP-1B engines on a dollar per engine flight hour basis.

Based in Ho Chi Minh City, Vietjet has been a CFM customer since it commenced operations in late 2011 with the CFM56 engine and currently operates a fleet of 65 CFM-powered aircraft.