Frequent flyers now have the ultimate app for checking itineraries and tracking flights. All you have to do is e-mail your travel plans to TripIt, which organizes a master itinerary (shared itineraries too) that you can view through the FlightTrack Pro app on your iPhone. The app is smart enough to predict flight complications based on weather. It also gives you access to airport delays and closures, real-time flight status and gate changes. And it helps you find another flight if yours gets canceled. If you need to let someone at the other end know that you'll be late, you can send an e-mail through FlightTrack Pro.