In iOS 6, Apple introduced the Passbook App for the iPhone and iPod Touch. Passbook is compatible with iPhone 3gs, iPhone 4, iPhone 4S, iPhone 5 and iPod Touch. So, what is Passbook? Passbook is the digital, location and time aware manager for all your boarding passes, loyalty cards, retail coupons, movie tickets, and more.  And, the list of compatible apps is growing all the time. For example, airlines like American Airlines and United have integrated their boarding passes with Passbook (See this article for more helpful travel apps: 5 Essential Travel Apps). If you have added an airline boarding pass Continue Reading →