To provide an aircraft maintenance schedule control system capable of performing sufficient landing preparation even when the maintenance time is different according to the model of an aircraft.

The aircraft maintenance schedule control system comprises an operation schedule data acquisition means 11 for acquiring the operation schedule data including at least the model and the landing scheduled time of a first aircraft of first departure and a second aircraft of second departure, a maintenance time acquisition means for acquiring the maintenance time necessary for maintenance from the model of the second aircraft described in the operation schedule data, a maintenance completion determination means 12 for determining whether or not the maintenance is started after the landing scheduled time of the first aircraft, and the maintenance is completed by the landing scheduled time of the second aircraft based on the maintenance time, and a maintenance start scheduled time changing means 13 for expedite the maintenance start scheduled time of the first aircraft when it is determined by the maintenance completion determination means that the completion of maintenance of the second aircraft is difficult at the landing scheduled time of the second aircraft.