While there are no legitimate "unlimited money" hacks for Airline Manager 4
The closest thing to "free money" in Airline Manager 4 is the advertising system. The developers allow players to watch short video advertisements in exchange for in-game currency. airline manager 4 free money
This is the single largest source of legitimate free money in Airline Manager 4 . It requires starting capital ($800 million to buy the contract), but once you do it once, you are set for life. While there are no legitimate "unlimited money" hacks