A computer travel reservation system includes at least one data processor connected with at least one memory that stores software executable by the at least one data processor. Also included is a fare family database connected with the at least one data processor that stores data defining a plurality of fare families each including a plurality of fare classes. The fare family database also stores data defining determination rules used to determine an association of at least one fare family for each fare class, each fare class being defined according to at least commercial parameters. The system further includes a fare fixing engine implemented by the at least one data processor and software. The fare fixing engine is configured to apply the determination rules to a travel product to determine a fare family associated with the travel product.