I reached the maximum number of devices. How can I revoke one device?

You can remove devices instantaneously by logging out of Air Navigation Pro. 
Go to Configuration > Account > Log out.
If you no longer have access to the device, you can revoke it by connecting to our website https://airnavigation.aero/en/. This procedure can take up to one week.
For immediate assistance, please send us your request at support@airnavigation.aero.