writes: Both Boeing and SpaceX better get their manned capsules working by 2019, because NASA at this point has no plans to buy more seats on Russian Soyuz capsules after the present contract runs out. Spaceflight Now reports: "Even as the commercial crew schedules move later into 2018, NASA officials say they are not considering extending the contract with Roscosmos -- the Russian space agency -- for more launches in 2019. The last Soyuz launch seats reserved for U.S. astronauts are at the end of 2018. It takes more than two years to procure components and assemble new Soyuz capsules, so Russia needed to receive new Soyuz orders from NASA by some time this fall to ensure the spacecraft would be ready for liftoff in early 2019." The second paragraph above notes that even if NASA decided it needed more Soyuz launches, it is probably too late to buy them and have them available by 2019.
"A Soyuz is a complicated vehicle, and a complicated vehicle doesn't come into existence in a matter of days," said Kirk Shireman, NASA's space station program manager. "It takes over two years to build a Soyuz, so yes, at some point in time, building a new Soyuz vehicle is not an option. We're working with our Russian counterparts on exactly when that is. We have not crossed that date yet, but I believe the date is in sight. It will be this calendar year when we will cross the point where we won't be able to build a Soyuz in time for when our last seats that we've already procured expire," Shireman said.