We had a discussion here in April about the plane flying a test flight:
Stratolaunch flies
Unfortunately:
Stratolaunch Systems Corporation, the space company founded by late billionaire and Microsoft Corp co-founder Paul Allen, is closing operations, cutting short ambitious plans to challenge traditional aerospace companies in a new “space race,” four people familiar with the matter said on Friday... As of April 1, Stratolaunch had only 21 employees, compared with 77 last December, one of the four sources said. Most of the remaining employees were focused on completing the carrier plane’s test flight.
https://www.reuters.com/article/us-s...-idUSKCN1T12FD