Hybrid-electric and all-electric aircraft power systems

A method of servicing an aircraft includes, while the aircraft is on a ground, actuating a connector module of the aircraft to release a power system of the aircraft. The power system is moved away from the aircraft using a ground vehicle that is separate from the aircraft. A different power system is moved to the aircraft in place of the power system and the connector module is actuated to engage the different power system to the aircraft. Each one of the power system and the different power system includes one of: an electric machine operatively connectable to an electric power source of the aircraft; and both a given electric machine and an electrical energy module electrically connected to the given electric machine to power the given electric machine.