ITA Software, owned by Google, the airfare search and pricing system that is still used by companies such as Kayak.com or Orbitz, is a well-known example of a successful industrial and large Common Lisp software. We’re legitimate to wonder if they still run it (they do), if Google develops more CL software (I don’t know), or if they put resources to improve a CL implementation: they do. According to https://mstmetent.blogspot.com/2020/01/sbcl20-in-vienna-last-month-i-attended.html:
