what is it? I cannot really understand and what does it do? how can it effect me?
Simply said, it is an index showing you the "demand" in the game world. The higher it is, the more demand there is.
How can it effect you?
Let’s assume you are a monopolist and have your aircraft filled at close to 100% at your prices at an AGEX of 922 (like Gatow is today):
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you’ll have less pax when the AGEX significantly drops
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you could either schedule more flights or increase the prices when the AGEX significantly rises above those 922
That’s true. Just keep in mind that as the time pass there will be more competition on the server you will no longer be a monopolist as more connecting flights will be available. Therefore you could see a drop in demand even if the AGEX is rising.