Mobile boarding passes are accepted at 101 airports worldwide on United and Continental flights. The app also lets users get real-time results for flight statuses and view interactive airport maps.

United initially rolled out its iPhone app in 2011 with features that let consumers download and store mobile boarding passes (see story). As consumers increasingly turn to their mobile devices to ...

Most airlines, and pretty much all legacy carriers (for example United, Delta, and American) have iPhone apps that allow you to check in and digitally retrieve your boarding pass on your phone.