This is a really cool app icon; it is giving you a preview of a window of an airplane and actually looking out at the sky. It was executed very well; the sky looks real and it has that bent look that windows give. I think people would be drawn to this app
Great use of negative space to incorporate 2 subjects into one: an airplane and a map icon symbol to represent traveling. It's easily understandable what this app icon is for, and the scaleability would work well since it's such a simply design.