TripAdvisor--Android, iOS, Windows Phone (free)
TripAdvisor offers a wealth of travel planning features, but it made the cut here thanks to its airline rating section. You can check star ratings, read reviews, and (maybe) gain the strength not to book flights on problem-prone airlines. The app is equally useful as a pressure valve if you want to lodge a complaint following a particularly exasperating experience.
Other TripAdvisor features help you compare airfares, find deals, ask travel questions (in the forums), book hotels, and find restaurants and entertainment near your destination.
Trakdot Luggage--Android, iOS ($50 with device)
Airline lost your luggage? There is, of course, an app for that--but you'll need a piece of hardware to go along with it. Trakdot Luggage pairs a location device planted in your luggage with an app that lets you track it. The app will alert you when your luggage has arrived with you upon landing, and will send you an alert when you're within 30 feet of the bag. However, this item doesn't go on sale until June.
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