Abstract: A method of allocating capacity in a vehicle, such as an airplane, which vehicle has a scheduled departure time and a predetermined starting and finishing location and where the capacity includes an inventory of passenger spaces which can be sold to a user is disclosed. The method includes determining at a predetermined time before the scheduled departure time, the number of currently available passenger spaces. The method further includes determining if any of the available passenger spaces can be made available for alternative uses. The method further includes receiving a request for available capacity in the vehicle from a third party to carry a load of cargo having a measure. The method further includes converting the available passenger spaces into an equivalent load having said measure based on a predetermined conversion factor. The method further includes allocating the equivalent load a required capacity.