The Boeing mission is called orbital flight test-2, in short OFT-2, and initially was scheduled for the end of March, but it is news of these hours the decision to postpone it at the end of the summer. Unlike what was previously announced, the second unmanned flight test of the boeing starliner was postponed in August or September. The capsule is the boeing bet to be part of the nasa commercial flight program, which also participates in spacex with its dragon crew.
In any case, according to a company statement, boeing will be ready from May, another launch window should appear. Therefore, boeing had committed to conducting a second orbital flight test to prove the safety of the vehicle before astronauts were taken.