I didn't know what a GDS was. Apparently it's a Global Distribution System and there's 4 major ones, including Sabre which I've heard of and 3 that I haven't.

I don't know how a normal person would have access to any of them. They're described as being offered via subscription to businesses.

https://www.bookingninjas.com/blog/gds-system-top-reasons-wh...