The New York Times recently ran an interesting story on the evolution of airline boarding passes:

First came the kiosk, a strange addition to airport terminals when Continental Airlines began offering it as a check-in option in 1995. It was followed by Web check-in, introduced by Alaska Airlines in 1999.

Now, with 80 percent of passengers using these self-service options, the next step is electronic boarding passes, which essentially turn the hand-held devices and mobile phones of travelers into their boarding passes.

Far off technology? Nope, it's already here:

[S]o far, Continental is the only carrier in the United States to begin testing the electronic passes, allowing those travelers to pass through security and board the plane without handling a piece of paper. Their boarding pass is an image of an encrypted bar code displayed on the phone’s screen, which can be scanned by gate agents and security personnel.

Read more at The New York Times.