Boeing's Starliner capsule is set to launch with two NASA astronauts on its first crew flight, making it a historic moment for the company.The crewed flight of a new spacecraft is a critical milestone as the lives of the astronauts are at stake.Butch Wilmore and Suni Williams, both experienced test pilots, will be piloting the Starliner on its journey to low-Earth orbit.This launch will add to the limited number of Western astronauts who have debuted a new human-rated spacecraft.