Take advantage of the free daily bonuses and events. Simply log in the game daily and also check the "Event" tab for special tasks to be completed.
Easy money
Advance the time on your device by however much is needed to generate money from your planes. Collect the coins then change the time back to its correct value.
Friends
Add friends based on their distance (clouds), and not by trying to get as many as possible. Their profile icon appear as clouds and this has a distance rating based on a number with "1" being the shortest and "5" the longest. Friend players having "5" cloud ratings. Also consider what routes that you are not able to travel so you can use your friends with them.
Fuel
Take advantage of cheap fuel prices. Because the price of fuel varies, make sure you purchase large amounts when it is cheap (under $10 per unit or $500 per 50 units).
Parts
Grind for extra parts by replaying previous missions. Use the parts to boost planes for more difficult missions.
Planes
Fill all plane slots as early as possible. Secure all available plane slot as soon as possible without waiting for missions to include it on your list. Do not worry if it is included later, as it will automatically be marked as completed. Naturally, this requires a lot of money. The more planes you are operating, the more money and experience points you will earn. Assign different paint colors to your planes. This will help you identify your planes and manage them easier. Do not use the auto-flight feature, unless absolutely needed during the single player campaign. Manual control has much better results than AI control.
Routes
When first starting, you do not need to fly long routes. Use Captain Joe to help you. You can easily generate money by deploying them to the closest destination to boost your experience. This will work well until you reach level 10. As you make progress, your goal is to provide longer routes for your client. Get rid of planes that cannot fly too far. By doing this, you can earn lots of coins in the long run without having to log in every few minutes to unload those planes. Longer routes will hold your money to the maximum allowed before you can collect money from your plane.
Daily bonuses...