In Pocket Planes, there are 2 different types of currency; bux and coins. Both have different uses and different ways of obtaining them. Coins are more common, and Bux are more rare and valuable.
Bux are the rarer and more valuable currency in Pocket Planes. Bux can be used to buy planes, plane parts, upgrade planes, remove airplanes from the Hangar, and give costumes to your pilots. You can even convert Bux to Coins! There are many ways to collect and obtain Bux in Pocket Planes. One way is to buy them in the Get Bux tab in the with real money. Another way to earn Bux is to complete special jobs that pay Bux instead of coins. You can also get a bux from watching a quick advertisement in the shop. Additionally, while watching a plane fly, a Bux will sometimes fly across the screen. if you tap on it, it will add it to your Bux bank account. Also, you get 3 Bux every time you increase a level.
Coins are the more common currency in Pocket Planes. Coins can be used to buy airports, upgrade airports, advertise airports, and buy new plane slots. Coins can be collected in many ways. One way is to deliver Jobs. The farther away the destination is, the more coins a bitizen will pay. Another way is to watch your planes fly and collect coins flying by. Occasionally, a big coin will fly by; tapping on them adds 10 coins to your Coin bank account instead of the usual 1. A third is by using the bank to exchange bux for coins. The last, and probably least common way to get coins is by selling plane parts.