This page lists all known issues of the simulation which are not classified as bugs / errors.
Airports
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Two airports cannot have the same ICAO code in the system. So thus the ICAO codes for Munich - Riem and Hong Kong - Kai Tak are slightly different than what they were in real life, as their respective new airports have the same ICAO codes as the old airports.
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Four minor airports in Africa and Asia do not have a ICAO code at all in real life (and each airport must have a code in the game) so the code has been randomly added and thus does not represent real life situation.