"Space taxis" refers to futuristic spacecraft designed to transport people through space, similar to how taxis transport people on Earth. Full definition
Boeing is the second company NASA is paying for space taxi services. (businessinsider.com)
Here's a quick look at when NASA started relying on Russia to send its astronauts to the ISS, and its blooming arrangements with private space taxi providers like SpaceX and Boeing. (techtimes.com)
Boeing is working on a crew capsule of its own, called the CST - 100, with a view to winning space taxi business not only from NASA but from Las Vegas company Bigelow Aerospace too. (newscientist.com)