The increase in the length of the 777-8's fuselage has boosted the aircraft's passenger capacity and range.
The Gulf carrier has firm orders for 115 Boeing 777X aircraft.
Boeing is bringing two new models of existing aircraft families, and both companies are excited to show off electric-hybrid aircraft technologies.
Accelerating The Transition: How Cathay Pacific Is Using Simulators To Prepare Pilots For The Boeing 777X
Deliveries of the Boeing 777-9 are not expected until 2025.
The jet features a spacious sitting room, an entourage area, and a private bedroom suite at the front of the aircraft.
One of the testbeds has been flying nearly everyday.
The airline boss is again expressing frustration with the lack of progress on the widebody plane.