But NASA announced today (May 17) that it's now eyeing May 25 for the liftoff, which will take place atop a United Launch Alliance (ULA) Atlas V rocket from Cape Canaveral Space Force Station, on Florida's Space Coast.

"The additional time allows teams to further assess a small helium leak in the Boeing Starliner spacecraft's service module traced to a flange on a single reaction control system thruster," agency officials wrote in an update today.

That leak was discovered earlier this week, prompting the mission team to push CFT's planned launch from today to May 21. Further analysis of the leak suggests that it's not a huge problem, but NASA, Boeing and ULA want more time to assess the situation, agency officials wrote in today's update.

"Pressure testing performed on May 15 on the spacecraft's helium system showed the leak in the flange is stable and would not pose a risk at that level during the flight," the update reads.

https://www.space.com/boeing-starliner-first-astronaut-launch-delay-may-25