Australia's Qantas airline has released a brand new iPhone app (free) with many great features, including Passbook support.
The Qantas Airways app lets customers find and book Qantas flights, book hotels worldwide, view flight bookings, access up-to-the-minute flight status, and create personalized alerts for specific flights and prices.
With Passbook support, fliers can check-in for most domestic flights and add their boarding pass to Passbook, meaning there's no need to carry a paper tick