Paper Airplane mode:
Complete all 48 levels to unlock “Paper Airplane mode” at the “Options” menu.
Medals hint:
Give planes with an emergency, such as “organs transplant” or “baby delivering immediately” priority as they become very impatient, and you will be awarded a medal.
Combos hints:
-Serve the larger planes after the small planes if possible to get a bigger combo bonus. Also, bigger planes are more impatient.
-Try buying a repainting plot so you can make all your gateways reach a 4x combo of each color. This is the maximum, and you will get the most combo points and a medal at the end.
Hidden cinematics hint:
Every airport location has a “hot spot” that you can click on for cinematics, dialog, and other hidden features. For example, click the church at Happy Valley Municipal.