Boeing selects RTX selected for NASA’s X-66A project

Two RTX business units, Pratt & Whitney and Collins Aerospace, will support Boeing with Pratt & Whitney GTF engines, and Collins nacelles and engine accessories. Pratt & Whitney and Collins will also support ground and flight tests, slated to start in 2028

https://www.aerotechnews.com/blog/2023/10/05/boeing-selects-rtx-selected-for-nasas-x-66a-project/