The wiki history of SABRE is an interesting read: https://en.wikipedia.org/wiki/Sabre_(travel_reservation_syst...
There is also an entry on IRS Individual Master File, but is short on information: https://en.wikipedia.org/wiki/Individual_Master_File
There is also an entry on IRS Individual Master File, but is short on information: https://en.wikipedia.org/wiki/Individual_Master_File
I remember spending whole evenings piecing together flights for a round-the-world trip at lowest cost. There was little or no error checking. I once almost booked a flight to Sydney, Nova Scotia, instead of the one down under.
Then, tragically, Travelocity shut down the service, leaving their crappy web-based frontend as the only online booking option until ITA came along.