I'd posted about this service a good while back, but it's really good to be seeing the idea hasn't been abandoned and seems to be expanding!

American Airlines to Offer Paperless Boarding Using Mobile « MobileBehavior :

American Airlines has plans to adopt paperless boarding technology in the Dallas/Fort Worth airport. Upon buying a ticket online, the system sends an e-mail to a user's smartphone containing an encrypted barcode to be scanned at flight check-in. According to Star-Telegram about 100,000 people a month already use paperless boarding. We can't help but hope that Foursquare's API be implemented like it has been with London's Oyster card.

It's also interesting what M-D November points out in the comments below the article, about Continental Airlines already running such a service... I looked it up and sure enough here's a couple of links with more info:

• Article 1
• Article 2
• Article 3 (note the numbers: 1.1 million passengers have used the service -- ~100.000 travelers a month)
  

Come on, it's already been almost a year and still nothing like that here in Greece! Looks like if I want paperless boarding through my mobile, I'll have to travel through San Fransisco, or some other U.S. airport.. :(