Thanks for picking the ball. After reading your post I did the following: I cleared cache and cookies of all web browsers, rebooted and logged back in. Was able to save airports as favorites. Android: uninstalled the app, rebooted, re-installed and logged back in. After that I was able to synchronize and save airports as favorites. Same counts for the iPad: Uninstalled the app, rebooted, reinstalled and logged back in. Now it worked. Well, a bit cumbersome but successful. Hope this post can help others. Again, thanks for your pointer. Cheers