According to a tweet by a NASA official, the first manned mission to ISS of Boeing’s Starliner capsule, carrying two NASA astronauts, has been delayed again, from the planned late April launch to sometime during the summer.
No reasons for the delay were given, as yet. The second link notes however that a schedule conflict at ULA, which is launching Starliner on its Atlas-5 rocket, might be part of the reason.
A launch in late April [of Starliner on the Atlas-5] would have put it in conflict with the inaugural launch of United Launch Alliance’s Vulcan Centaur rocket, currently scheduled for as soon as May 4. Vulcan and Atlas use the same launch pad at Cape Canaveral Space Force Station, and ULA has been conducting tests of the Vulcan rocket on that pad. It has not shared updates on the status of the Atlas 5 used for Starliner.
This conflict might also explain why Starliner itself has not yet been fueled, since Boeing officials have said they want to do this within 60 days of launch to avoid the same kind of valve leaks that delayed the second unmanned demo mission for almost a year.
Starliner itself is years behind schedule, a long delay that has cost Boeing an enormous amount of income. First, the problems during the first unmanned demo flight in December 2019 forced the company to do a second unmanned demo flight, on its own dime costing about $400 million. That second flight was then delayed because of those valve issues. All the delays next cost Boeing income from NASA, as the agency was forced to purchase many manned flights from SpaceX that it had intended to buy from Boeing.