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Airlines Control Program
Airlines Control Program, or ACP, was the operating system developed by IBM in 1969 for processing airline reservations and related data. 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.
In February 1979, ACP became known as ACP/TPF and then just TPF (Transaction Processing Facility) as the transaction operating system became more widely implemented by businesses other than the major airlines.
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