Forecasting models of demand based on the increase in time of reservations => pickup. The arrival date for which the forecast is made is constituted by the “business on the book” (the number of reservations received until today) to which an estimated number of reservations is added from today until the date of arrival. The estimated part will be obtained (through means, weighted means,etc.) by observing an average of reservations received X days before arrival over N dates (similar dates, for reservation trends, to the arrival date for which the forecast is made.) The forecast model may only be based on past statistics or on statistics from the booking period to be completed.