Thus, if you have received a refusal, all the work comes down to verifying or refuting the refusal.
It can be quite simple, for example, in case of refusal due to bad weather, in some cases, it is enough to study the weather reports to verify that the refusal is legitimate.
In less clear situations, you will need to request additional information from the dispatch center, airport, and other sources and conduct a more thorough analysis. The complexity lies in the fact that the concept of "flight weather" does not exist, and the decision to take off/land is based on a whole range of factors (runway availability, aircraft technical characteristics, pilot qualification level, etc.).
By law, the airline must provide you with all the necessary information so that you can effectively defend your rights. However, do not expect the airline to provide you with confirming documents. In most cases, they will be limited to a weather report from a free source, and in practice, you will have to collect and analyze evidence yourself.
Also, in each country, there is a national aviation authority (in Ukraine - the State Aviation Administration), which can accept your complaint to the airline and conduct an independent investigation. Unfortunately, their decision is not binding (they can only impose a fine on the airline). The next instance is the court," - Flyhelp explains the procedure.