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Yes, it used to be accessible directly, and still is, at least with one level of indirection, via https://www.virtuallythere.com/

But this is also a red herring because I don't think sabre is used to manage pilots times off.

You can find some interesting results by googling site:virtuallythere.com

I think AA is still using SABRE internally for some components for crew scheduling; I did some SABRE work for them back in 2005/2006 as a contractor, and there were still bits and pieces of legacy code from the 90's in place when I was over there.

You could access SABRE pre-1996 via online services such as The Source, CompuServe, GEnie and AOL. Sabre Holdings launched Travelocity in 1996.

I remember this too. Used to go in there to look around and play with all he variables (flight schedule, fares, etc). I think it was called EaasySabre