Originally Posted by
SFOAAFlyer
The reservation system now known as SABRE was developed for American Airlines by IBM in the 1960-70s. Sabre was later spun off as a separate company servicing multiple airlines. Since AA was the first, it was given 001.
Not true. American was 001 as long as there was an Airline Reporting Corporation (or its predecessors). Goes WAY back before Sabre.