Complicated
If you want to sit look up at the sky and see where the plane overhead is going to. This app Scores 6 out of 5. If you want to follow a flight a friend is on, say from London to Cayman via Miami. It's a nightmare. It not intuitive, you need to learn all settings. I previously used flight tracker ( no longer available ) which was so simple. Punch in your flight and one screen was updated. A bit like a departure board. With this app it's like it's sends you email after email after email with the latest update. If you track a flight it seems to drop you out, you then need to check back in and re-tract the flight. Just not an easy app for those that just want to track a flight from A to B.