This app was mentioned in 4 comments, with an average of 4.25 upvotes
I really liked playing Piloteer, homegrown right here in Chicago. https://play.google.com/store/apps/details?id=com.whitakr.Piloteer&hl=en
And while only iOS I have to give a shout to "Progress to 100", fun little experience you have to try if you have an iPhone.