This paper describes the modeling of aircraft's maneuver to support pilot-in-loop flight simulation. The aircraft's maneuver is modeled on base of analyzing the kinematical features of aircraft in different flight modes, related with airborne sensor working state and load release. According to the kinematical features, the relation between aircraft's maneuver and airborne sensor's working state and load release path/envelope is modeled. Through the model, the Pilot Control Instructions (PCI) can be simulated. The model can reflect not only the kinematical features of an aircraft but also the relation between aircraft motion and airborne sensor's working state and load release in modern flight. Resulting from the model, the simulated PCI can satisfy a pilot's needs in the flight simulation. The model is estimated through pilot-in-loop interception flight simulation. The results indicate the rationality of the model. The model can also be used in other states of aircraft's pilot-in-loop simulation system.