Passbook is a travel wallet app that holds digital boarding passes, hotel confirmations and other booking tickets, then uses the iPhone's GPS sensor to pop up the required boarding pass around the location of use.
Though it launched with relatively few airlines and hotels on-board, the app now supports boarding passes for dozens of airlines and travel companies, including Airbnb and Booking.com.
Of course, boarding pass apps, trip organizers and other travel helpers are readily available on Android (and to a lesser extent, BlackBerry and Windows Phones).
For now, Passbook is an advantage only for multi-stop trips where travelers are likely to be carrying more than a couple of boarding passes or hotel bookings at a time.
Should existing iPhone users upgrade to iOS 7?
"Software updates fix bugs, enhance performance and add new features," says Richard Lai, editor in chief of consumer tech blog Engadget China.
"It's up to developers then to take advantage of the new tools in their apps."
Users of the iPhone 5, iPhone 4S and iPhone 4 will be prompted by Apple to update sometime this month, while iOS 7 will be available for the second-, third- and fourth-generation iPads plus the iPad Mini later in the year (rumored to be October).
As for whether an iPhone packing iOS 7 is a worthy alternative to the slew of other smartphones, it comes back down to those nice new photo/camera features and the apps.
Great travel apps for iPhone such as Skyscanner flight booking and TripAdvisor guides are usually also available for Android, while major apps such as TripIt travel organizer and Skype calling will also support Windows Phone and BlackBerry.
For current iPhone owners, iOS 7 will make photo organization simpler, but it won't revolutionize their next trip away -- the next generation of iOS 7 apps could.