Building a massive international airport takes a lot of cash. In Airport Tycoon, you need millions to buy new planes, terminals, and runways.
Luckily, the developers release frequent codes to give you a head start. Here are all the working codes for January 2026.
Don't just spend your cash on planes! Invest in Upgraders (droppers) inside your terminal first. This increases your passive income, meaning you earn money even while you are AFK.