Blue Coins (basic currency): This is the most common currency used for upgrading licenses and purchasing planes. It is also the most common reward for completing contracts.

AC Credits: This currency can be earned via daily/weekly/monthly tasks, participating in events, or making purchases in the in-game store. It can be used to speed up time-restricted transactions such as license exams, to substitute regular currency, to refill the tank in events, etc. Any time you can use the AC Credits to accomplish something, the green AC icon or button will be displayed somewhere on the screen, usually accompanied by the number representing the price.

Flight Points: This is a special currency used to unlock new activities in the game (contracts).

Fuel Barrels: A special currency used in the Charter Fleet to complete flights. Each Charter Fleet flight has a value measured in barrels. When all barrels are spent, a player needs to wait for them to replenish or purchase more in the in-game store.