Stability is vastly more important than new functionality in that context.
Can you document that? I was under the impression that they used SQLite for on ground simulations?
Rockwell-Collins is the organization that prompted Dr. Hipp to obtain DO-178B. I actually worked at Rockwell-Collins in the early 90s.
I do generally prefer airlines flying Airbus, BTW.
"Airbus confirms that SQLite is being used in the flight software for the A350 XWB family of aircraft."
https://www.sqlite.org/famous.html
Stability is vastly more important than new functionality in that context.