NASA is considering buying seats aboard the Soyuz spacecraft for 2019, according to a solicitation it filed recently. The agency originally wanted to end its dependence on Russia's Soyuz spacecraft this year, but SpaceX and Boeing aren't quite ready to take astronauts to the ISS. Boeing had to push back its first manned flight to the space station to December 2018 or later due to a design flaw with the Starliner. SpaceX also had to delay its plans after a Falcon 9 exploded on the launch pad last year. While both companies could very well be able to stick to their new timelines, NASA could be eyeing the purchase as an insurance in case of additional delays. Besides, seats on the Soyuz keep getting more expensive every year.