Did you know that the reservations systems of the biggest carriers mostly run on a specialized IBM operating system known as Transaction Processing Facility (TPF). Designed by IBM in the 1960’s it was designed to process a large numbers of transactions quickly. Although IBM is still updating the code, the last major rewrite was about ten years ago. With all the major technologies changes since then, it’s clear that IBM has already accomplished a herculean task by keeping an application viable for over 50 years!