An Australian man running a developer preview of iOS 6 discovered when he checked in for a Virgin Australia flight using the airline's website on his iPhone that Passbook -- a forthcoming feature that is meant to "store" digital passes, tickets and membership cards -- had detected the checkin and offered to save the boarding pass. The discovery indicates the development on the new feature is already in an advanced state, with support from existing partners or the ability of the software to detect some types of check-in and act on them.
