This is well over 20 years old and is based on pre 9/11 flight data. I would suspect that a lot has changed since then. So proceed with no caution at all.
From 2001, a message from the same author as the linked paper:
> (Here's an email Carl de Marcken of ITA Software sent to a friend, describing their experiences using Lisp in one of the software industry's most demanding applications.)
* https://en.wikipedia.org/wiki/ITA_Software
From 2001, a message from the same author as the linked paper:
> (Here's an email Carl de Marcken of ITA Software sent to a friend, describing their experiences using Lisp in one of the software industry's most demanding applications.)
* https://www.paulgraham.com/carl.html