Abstract: A process for determining the number of available transport seats in a computerized reservation system, which includes elements for storing data on services that provide transportation between two locations and their current reservation status, broken down by class of service, a process in which, at a predefined level of expected revenue, a number of seats available locally for a given class of service of a transport service is determined. The following process are carried out: selection of at least one other class of service of a transport service; determination of the number of seats available locally for the class of service of the transport service, at the predefined level of expected revenue; determination of an overall number of seats available for the class of service of the transport service at the predefined level of expected revenue as a function of the different numbers of seats available locally.