Whenever I launch Airport City, I sit there for 30 seconds while waiting for the program to connect to Amazon Game Circle whose only purpose seems to be letting me know that I've been spending way too much time playing Airport City. After that's finally connected (or not), I get a dinosaur-dog animation followed by another 30-50 second wait as Airport City "loads". With luck, I finally get into the game. I start to play, but things are sluggish. After a while the game hangs and the following requester pops up on the screen: "Amazon Appstore required. Amazon Appstore is not installed on your device. Please install Amazon Appstore and sign in to Amazon to use this app. Ok." After clicking on Ok, I'm whisked from the program to Amazon App Store presumably to install Amazon App Store. I can either stop the app or reboot the device to play the game a couple times before this happens again. I'm thinking Amazon App Store is installed on my device. I'm thinking the code that detects Amazon App Store sucks. I've complained to customer support. Nothing much came of it. This problem and ydl are two reasons I don't spend much money on Airport City. Just FYI. Thank you for your time. Fire HD 7 (4th Generation)