First i have to say that I enjoyed the game very much. But the concept doesnt work any longer when you come to Europe. There I can do two Quests before I need a bigger plane. Problem is that I cant rise up my Rank as fast as in tho lower Ranks when I was in Africa. So I have to fly around for hours making a lot of Money just to buy the 2nd plane? Why dont you make the planes far more expensive in Europe but therefore the first 5 ones free to buy whithout a higher Rank?
What is really annoying is that I destroy thousands of crates to get Gold but I dont need that Gold everytrhing important is bought with Diamonds and I get ten per card to spend them emmediately.