How to unlock expensive airports in airport madness 3D 2 (No hacking or Root)?

Airport madness have many expensive airport’s that all of us like to buy. Here I found simple method to use the airport without buying it. It’s easy. It can be done simply by tapping separately with the first two fingers (1,2.1,2) slightly below the name of the airport fast. ~ Idea Finder ~ Virtual standards ~ Airport Madness 3D Volume 2