The aircraft has been used to launch rockets.
Mark Finlay - 19 January 2023
Before we get into what happened to the Stargazer, let's first take a look at the Lockheed L-1011 TriStar and see how it came to be. In the late 1960s, American Airlines approached Lockheed and Douglas and asked the aircraft makers if they could build a medium-to-long-range, wide-body trijet airliner. A stipulation was that it would be big enough to carry as many as 250 passengers on transcontinental routes.
Having experienced some difficulties with its military aircraft program, Lockheed was eager to renter the civilian airliner market. In answer to American Airlines request, Douglas came up with the DC-10 and Lockheed the L-1011. Because Lockheed built the TriStar using the latest technology available, the price of the plane was more expensive than the DC-10. The design of the TriStar featured a two-aisle interior, large enough to accommodate as many as 400 passengers in a single-class configuration.
https://simpleflying.com/stargazer-the-story-of-the-last-operational-lockheed-tristar/