NASA is planning for NextGen spacecraft that suits its needs. Now NASA spends nearly $71 million for each one-way trip for astronauts to space using the Russian Space Shuttle
In the screen list, the first one is Dragon V2 by startup firm SpaceX. It has been used to send cargo to the International Space Station (ISS) but now, it has been upgraded to land on solid ground with the use of thrusters, as well as the capability to bring humans.
Second spacecraft is Boeing's CST-100, which is a pyramid-shaped capsule that would be launched to space atop a rocket and this would be the Atlas V rocket developed by Boeing and Lockheed Martin.
The third space vehicle on the screening list is Dream Chaser by Sierra Nevada Corporation, an aerospace electronics company. This vehicle differs greatly from the first two as it is shaped as a sort of space-plane.
However, now NASA is expected to take a final call on which of these spacecraft to be used by next month.