It's also used in aerospace and safety critical systems work in Europe, though I'm not sure the extent. In the US, post-mandate, that work is almost all Fortran, C, C++, or now maybe Rust (I'm meaning work that started after the mandate, pre-mandate it was more varied).

787 was the newest system I worked on in the US that used Ada, and that was optional for the software vendors. I think the OS our software ran on was written in Ada, though.