Fourth 777X joins flight test program

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. READ: US Congressional report a missed opportunity.  Here is a video of one of its taxi tests. https://twitter.com/i/status/1307784485778325504 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. T