A first and a second aircraft are detachably coupled where the first aircraft is configured to perform a vertical landing using a first battery while the first aircraft is unoccupied and the unoccupied first aircraft includes the first battery. In response to detecting a second, removable battery being detachably coupled to the first aircraft, a power source for the first aircraft is switched from the first battery to the second, removable battery. After the switch, the first aircraft takes off vertically using the second, removable battery while occupied. The detachably coupled first aircraft and second aircraft are flown using the second aircraft (the power to keep the detachably coupled first aircraft and second aircraft airborne comes exclusively from the second aircraft and not the first aircraft).