Stanje atmosfere ima vrlo veliku ulogu na let i performanse zrakoplova. Najznačajniji utjecaj je utjecaj temperature. Temperatura u atmosferi podložna je stalnoj promjeni zbog različitih pojava kao što su tople ili hladne fronte, godišnjih doba, geografske lokacije. Kako varira temperatura u atmosferi tako će varirati i performanse dajući različite vrijednosti potiska i uzgona slijedeći pravilo: viša temperatura – lošije performanse, niža temperatura – bolje performanse što potvrđuju napravljeni proračuni. Važno je poznavati kakve će performanse imati zrakoplov u letu, stoga su pojašnjeni pojmovi visine po tlaku i visine po gustoći. Uz to, mnogim formulama u tekstu prikazano je kako izračunati i doći do određenih informacija koje se odnose na performanse zrakoplova.

The state of the atmosphere has a very important role in the flight and performance of an aircraft. The most significant influence is the influence of temperature. The temperature in the atmosphere is subject to constant change due to various phenomena such as hot or cold fronts, seasons, geographic locations. As the temperature varies in the atmosphere, this will vary in performance by giving different values of thrust and lift by the following rule: higher temperature - worse performance, lower temperature - better performance, which confirms the calculated calculations. It is important to know what performance aircraft will have in flight, so the terms pressure altitude and density altitude are explained. In addition, by many formulas in the text it is shown how to calculate and get certain information related to aircraft performance.