IBM Airline Control Program, or ACP, was an operating system developed by IBM beginning about 1965. In contrast to previous airline transaction processing systems, the most notable aspect of ACP is that it was designed to run on most models of the IBM System/360 mainframe computer family. This departed from the earlier model in which each airline would have a different, machine-specific transaction system.
Development began with SABRE (Semi-Automatic Business Research Environment), Deltamatic, and PANAMAC. From these Programmed Airline Reservations System (PARS) was developed. In 1969 the control program, ACP was separated from PARS; PARS keeping the functions for processing airline reservations and related data.
In December 1979, ACP became known as ACP/TPF and then just TPF (Transaction Processing Facility)[1] as the transaction operating system became more widely implemented by businesses other than the major airlines, such as online credit card processing, hotel and rental car reservations, police emergency response systems, and package delivery systems.
See also IBM Airline Control System (ALCS), a variant of TPF specially designed to provide all the benefits of TPF (very high speed, high volume, high availability transaction processing) but with the advantages such as easier integration into the data center offered by running on a standard IBM operating system platform.
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