Paper Is Out, Cellphones Are In - New York Times

Another reason to make sure your batteries are fully charged before you leave home...

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

At least half a dozen airlines in the United States currently allow customers to check in using their mobile devices, including American, Continental, Delta, Northwest, Southwest and Alaska.

Paper Is Out, Cellphones Are In - New York Times