For one, the service that performs the vast majority of airfare searches -- formerly ITA Software, now Google Flights.
Having spent time at the MIT AI Lab and having co-founded a company whose principal product was a Lisp/C hybrid, I think the challenge with mainstream adoption of both Lisp-like and functional languages is the syntax. There's an element of "don't use a programming language that's hard to hire for" but I think that's secondary as it never bothered us or posed a real problem.
Naughty Dog's Crash Bandicoot games (which I also worked on) used Lisp for all the character control logic.
Having spent time at the MIT AI Lab and having co-founded a company whose principal product was a Lisp/C hybrid, I think the challenge with mainstream adoption of both Lisp-like and functional languages is the syntax. There's an element of "don't use a programming language that's hard to hire for" but I think that's secondary as it never bothered us or posed a real problem.
Naughty Dog's Crash Bandicoot games (which I also worked on) used Lisp for all the character control logic.