Upgrades within the game are much too expensive, some of the upgrade are equal to a person monthly income. To top it off they included engine upgrades right down to increasing battery level before you can upgrade the engines, my plane was initially strong for some reason it grows weaker after every upgrade, I can't play suscessfully to win containers like before, the customer support just gives robotic response. It's frustrating. The game is great if they could just be subtle even just a little