Abstract: A configured aircraft flight management aid system comprises: means of interpretation receiving data taken from external instructions from an external control center, data relating to aircraft equipment failures, cabin problems and problems related to the environment of the aircraft; means of determination receiving data from the means of interpretation and determining at least one reference constraint associated with at least one parameter representative of a flight path, a reference constraint associated with a reference parameter comprising a new constraint, different from the initial constraint when the item of data effectively necessitates following a new path, different from the initial path, and a reference constraint comprising the initial constraint when the means of determination do not have access to any data relating to an event effectively necessitating following a new path; warning means generating a warning to an operator when the path actually flown does not comply with said reference constrai