![](https://www.nasa.gov/sites/default/files/thumbnails/image/jsc2019e050522.jpeg)
NASA astronaut Mike Fincke works through a check list inside a mockup of Boeing's CST-100 Starliner during a simulation at NASA's Johnson Space Center on Aug. 21, 2019. via NASA http://www.nasa.gov/image-feature/testing-and-training-on-the-boeing-starliner