Decades-old, duct-taped architecture is endemic across the airline industry though, and AFAIK Southwest isn't even particularly bad on this front. American Air

Decades-old, duct-taped architecture is endemic across the airline industry though, and AFAIK Southwest isn't even particularly bad on this front. American Airlines's original reservation system Sabre, still a major GDS player today, was first put together in the 1950s and is by some reckonings the oldest commercial (as in, non-government/military/research) computer system out there. https://en.wikipedia.org/wiki/Sabre_(computer_system) https://en.wikipedia.org/wiki/Sabre_(computer_system)