Additionally, United's mobile boarding pass option is now available to customers departing from airports in London, Munich, Amsterdam, Brussels, Geneva, Zurich, Moscow and Osaka. United plans to introduce the mobile boarding pass option at additional international airports, including Frankfurt, Tokyo Narita and Hong Kong, in the coming months. United currently offers paperless boarding at 62 U.S. airports, including its hubs in Chicago, Denver, Washington Dulles, San Francisco and Los Angeles.

"The expansion of our mobile check-in feature and paperless boarding option to international travel enables our customers to enjoy even more flexibility and control throughout their travel experience," said Martin Hand, vice president of customer experience.

Continental Airlines currently offers the mobile boarding pass option at 70 airports, including its hubs in New York, Houston, Cleveland and Guam, and international destinations including London, Frankfurt, Munich, Brussels, Zurich, Geneva, Amsterdam and Saipan. Customers flying on any Continental flight may check in at continental.com using a Web-enabled mobile device.

United and Continental mobile boarding passes display a two-dimensional bar code along with customer and flight information, which scanners at the security checkpoint and boarding gate validate. A refresh of the mobile boarding pass will reflect any changes to seat assignments, gate changes and upgrade confirmations. The technology prevents manipulation or duplication of the boarding passes and heightens security.

In addition to using the more environmentally friendly paperless boarding pass option, customers may also use Web-enabled mobile devices to check flight status, flight availability, itineraries and Mileage Plus(R) accounts, and sign up for notification via email, phone or text message of any changes to flight status. With the My Itineraries(SM) function, customers can view their itineraries and, in the event of missed connections, see the flights on which they have been automatically rebooked, rather than waiting in line at the airport for agent assistance.