In this study, solar powered airplanes and hybrid electric airplanes are examined. Today, with the depletion of fossil fuels and their harmful effects on the environment becoming visible, it has become necessary to use alternative energy more in every field. Solar energy has become one of the most used renewable energy sources as a result of achieving the desired level of performance with the developing technology. As a result, the construction of airplanes flying with solar energy has been accelerated. Battery-powered airplanes have the lowest CO2 emissions and environmental benefits. Continuous improvement of aircraft fuel efficiency plays a crucial role in the work towards the carbon reduction target. Solar powered airplanes produce neither CO2 nor polluting emissions that affect air quality. Their noise generation is much lower than that of aircraft powered by internal combustion engines. Hybrid-electric aircraft are seen as a very effective alternative to conventional short- and medium-range aircraft in the near future. The biggest advantage of solar powered flights, and the main purpose of developing them, is that they depend on a clean form of energy with zero harm to the environment. Solar energy is a clean, free and renewable energy source, which gives it a great advantage over fossil fuels. It is a fact that the use of solar energy, which is an alternative energy, in aircraft is very important in reducing fossil fuels as a result of both a clean nature and reducing aircraft engine noise.