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Compatibility: iPhone, iPod touch, and iPad. Requires iOS 4.3 or later.
Flightview is one of my favorite apps as I tend to travel often throughout the year. The app displays flight information, cancellations and delays in real-time, and you can track flights while they are in the air (which is more addictive than it sounds). If you input a flight you're waiting for or planning to catch, you can set the app to update you with status alerts.
Via: Apple App Store