NASA has carved out more time to talk through problems with its attempt to send up astronauts on Boeing's CST-100 Starliner, which is now targeting June 1 if mission managers give the go for launch.

The new date announced late May 22 is just a placeholder, though, as NASA has yet to sign off on issues that were found during a launch attempt earlier this month. If NASA does give the OK, the Crew Flight Test mission would aim for a 12:25 p.m. liftoff with backup options on June 2, 5 and 6.

NASA astronauts Butch Wilmore and Suni Williams would climb back on board the Starliner spacecraft sitting atop a United Launch Alliance Atlas V at Cape Canaveral Space Force Station's Space Launch Complex 41. The goal is to test out the spacecraft flying with humans on board for the first time as it docks with the International Space Station for about an eight-day stay before a return trip to Earth landing in the desert in the western United States.

The pair had suited up and come within two hours of a launch back on May 6, but a fluttering valve on the ULA rocket's upper stage forced a scrub of the launch attempt with mission managers deciding to roll the rocket back to ULA's nearby Vertical Integration Facility to replace the valve.