Methods and systems are provided for integrating aircraft flight parameters generated by an offboard portable electronic device (PED) into an onboard flight management system (FMS). The method comprises selecting the aircraft flight parameters to be generated by the PED for use by the FMS. The current flight data is accessed for the aircraft with the FMS and providing the current flight data to the offboard PED. The rules for the aircraft flight parameters are computed with the offboard PED based on the current flight data for the aircraft and transmitted to a flight management (FM) adapter. The FM adapter confirms that the rules for the aircraft flight parameters comply with operational limits of the aircraft and then translates the rules of the aircraft flight parameters to aircraft operational targets for use by the onboard FMS. The aircraft operational targets are then loaded from the FM adapter into the FMS.