Only 3 more days until we debut the completed #777X flight test airplane! The 777X will be the largest, most efficient twin-engine jet in the world. Here's a look back to the first time it took a simulation flight. Check out more of the 777X journey here: bit.ly/reveal777X | The Boeing Company

Meet WH003. We ran the engines on our third #777X test airplane last week and will continue ground testing and preparations for flight in the weeks ahead. | The Boeing Company

Our first #777X flight test airplane made its runway debut! Our teams performed a series of low-speed taxi tests, marking the first time this plane moved on its own power. This is one of many tests before the 777X takes to the skies later this year. | The Boeing Company