The transition from fossil fuels to sustainable energy sources is an important challenge for current aviation industries. One of the critical questions in this transition is how much electricity is needed to accommodate future air transport demand and how to supply it. The answer depends on the type of energy carriers, their production process, and the source of the electricity. This paper provides a methodology to estimate the annual required electricity to produce energy carriers (particularly electrofuel and liquid hydrogen) with a given energy production process for an airport. The methodology also computes the surface of solar panels and/or the number of wind turbines needed to produce the annual electricity, which shows the possibility of energy self-sufficiency within the region around an airport. We apply the methodology to the Carcassonne Airport located in the Aude department, France, where sustainable energy sources are easily accessible. The result shows that 112 GWh and 138 GWh of electricity will be required when all the airplanes departing and landing at the airport in 2022 are replaced with electrofuel and liquid hydrogen-powered airplanes, respectively. 49 ha of solar panels or 21 onshore wind turbines are necessary to supply the required electricity in the case of electrofuel. 61 ha of solar panels or 25 onshore wind turbines are necessary to supply the required electricity in the case of liquid hydrogen. This corresponds to 1% to 3% of the electricity production of the Aude department in 2030, which implies that energy self-sufficiency of the airport is feasible. The methodology is also applied to all French airports in 2016. The total electricity required at the national level and per airport is assessed. This methodology can contribute to the elaboration of national and local energy strategies for aviation.