To access your airport information, click on the airport you want to view. Then, look for the “ROUTES” tab at the bottom of the airport window. This will show you a list of all the routes you’re currently connected to.
If you want to upgrade one of your planes to the next level, just tap on the airplane you want to upgrade. It’s super easy! Just keep in mind that level 10 is the highest level you can upgrade any plane to.