The general field of the invention is that of systems for aiding the guidance of a first aircraft travelling around an airport zone. The system according to the invention comprises: a set of databases comprising bulkiness and performance characteristics of the said first aircraft, geometric and technical characteristics of the airport zone and information about the air traffic in the immediate environment of the said first aircraft; calculation means making it possible to firstly determine a safety zone around the said first aircraft taking into account at least the position of the said aircraft, its size and the uncertainty in the measurement of its position; and then a taxiing indication on the basis of the information arising from the databases and the characteristics of the safety zone; viewing means displaying at least one view of the airport one in which the first aircraft is situated and a representation of the said taxiing indication.