$10. Current version average rating: 4.5 stars Designed for iPhone, iPad
FlightTrack Pro is the single most useful app for frequent business travelers. So many features, so little space to describe them, but here goes: The app integrates with TripIt and your iOS calendar beautifully. Live flight tracker maps pinpoint a plane’s current location as well as the weather. Maps work in offline mode, so you can use the app in flight. Flight updates are pushed to your device, even when the app’s closed. And for an extra $4, you can view an airport’s current arrivals and departures 'board,' as this screen shot illustrates. To paraphrase that old American Express ad, don’t leave home without this app.