NASA Wraps Up X-57 Program without a Flight

The X-57 project has also eaten up a lot more of NASA's federal budget than was originally intended. It was initially expected to cost $40 million to get the Mod IV in flight by May 2018. By the end of 2022, NASA said the program had incurred costs of more than $87 million, and the agency had budgeted for a total cost of $99 million through the end of FY 2023. According to NASA, the X-57 program would require at least another $64 million to complete the Mod IV by 2027, and the agency determined that "the small percentage of the industry that would benefit did not justify the additional cost and delay,"

https://www.ainonline.com/aviation-news/advanced-air-mobility/2023-06-29/nasa-wraps-x-57-program-without-flight