Washington (AFP) – Boeing’s Starliner capsule headed back to Earth Wednesday in the final step of a key test flight to prove itself worthy of providing rides for NASA astronauts to the International Space Station. The spaceship autonomously undocked at 2:36 pm Eastern time (1836 GMT) and was set to touch down in New Mexico just over four hours later, at 2249 GMT, wrapping up a six-day mission crucial to restoring Boeing’s reputation after past failures. “#Starliner separation confirmed,” tweeted Boeing Space. Orbital Flight Test-2 (OFT-2) is the last hurdle for Starliner to clear before it car…