Ok, so these may not be the simplest instructions ever: The plane will collect money without you doing anything. The top 2 variables tell you your money and how much money you get from flying to each airport. The bottom 2 variables tell you the price of extra income (the money you get from flying to each airport) and extra planes. It's obvious where you click to get these things. Each time you buy a plane or income, the price becomes higher and the price it will increase by next time becomes higher.
This game may seem fairly boring at the moment, but I am adding in extra scenarios (only one in game currently). Stick around for between a minute and 3 minutes to find the scenario. New Update 1.1 You can now have infinite planes Bug Fix you can no longer use electric planes infinitely