A fourth 777X has joined the Boeing flight test program.
The aircraft, dubbed WH004, will test cabin systems, extended operations and more as part of the test program.
Here is a video of one of its taxi tests.
— Jennifer Schuld (@JenSchuld) September 20, 2020
The 777-9 seats 426 passengers in a typical two-class configuration, with a range of 7,285 nautical miles (13,500 km). The 777-9 will have the lowest operating cost per seat of any commercial aeroplane says Boeing.
The 777-8 seats 384 passengers with a range capability of up to 8,730 nautical miles (16,170 km). Boeing says that range is only just part of the story.
The 777-8 also has the capacity to provide more revenue through more payload and improved fuel efficiency at both short and long ranges. This capability also allows the 777-8 to carry that increased payload at more challenging airports such as those constrained by high altitudes or hot temperatures.