Ensuring long‑term sustainability within the aviation sector requires the development of alternative propulsion technologies, among which aircraft electrification is one option. A key challenge for the implementation of electric aircraft is the need for rapid charging, driven by short turnaround times, which typically results in charging durations of less than one hour. Such high‑power charging events introduce substantial power peaks; however, both the magnitude of these peaks and the extent to which they may be mitigated through local energy generation or storage remain unclear. Moreover, implementation of fast-charging power demand of electric aviation is commonly estimated using hourly averages, a practice that systematically underestimates short‑duration power peaks. Accounting for higher‑resolution demand patterns during the planning phase is therefore crucial for designing local power systems that are technically viable and economically sustainable. This study presents the development of a modelling framework representing small airports with on‑site charging of electric vehicles and electric aircraft, in which minute‑resolution power demand data are used instead of conventional hourly averages. The framework further incorporates models of photovoltaic generation and a battery energy storage system to assess their capacity to attenuate potential power peaks. Empirical data from two small airports were employed to evaluate the model. The results indicate that estimated power peaks associated with charging of electric vehicles and electric aircraft increase by approximately 89–110 % when minute‑resolution data are used instead of hourly values. In addition, the power peaks for small airports can increase by more than 300 % due to electric aircraft charging.