Planes Live - Flight Tracker
Planes Live - Flight Tracker from developer Apalon Apps is another outstanding flight tracking option for iPhone and iPad.
The free version of the app comes with just about everything you'd need to ensure you get to the airport on time and/or make your connection.
The app allows you to track planes and helicopters around the world, alerts you to flight changes, and allows you to add your favorite airports and locations to a "My Places" tab for easy access. If you fly out of the same airport a lot, this comes in handy.
One other thing I like about Planes Live is the clean user interface. It's easy to navigate and see the important data.
There's also a premium version of the app that provides an unlimited number of alerts, 2x faster data update, and no ads.
Most of you should be fine with the freemium version though.
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