I don't think Southwest was ever on Sabre. Their scheduling used to be in-house, now on Amadeus. Computerized operations started with Braniff's software and hav

I don't think Southwest was ever on Sabre. Their scheduling used to be in-house, now on Amadeus. Computerized operations started with Braniff's software and have ... ah, grown since then. Name almost any technology and it's probably running somewhere in their stack.