[muuh-gnu]

Lisp became a "language internally used by Google" when Google purchased ITA with a Lisp code-base so large and Lisp-only staff so large, that it is unlikely that it will ever be rewritten or that the staff will be retrained to use Java.

[gohrt]

ITA had a small staff, and was not Lisp-only. They were hiring people to do Java work >5 years ago.