United currently offers passengers the ability to check-in at united.com with their Web-enabled mobile device and use paperless boarding at 62 U.S. airports, including Chicago, Denver, Washington Dulles, San Francisco and Los Angeles. Now the airline is expanding its mobile boarding pass option to travelers with international itineraries departing from airports in London, Munich, Amsterdam, Brussels, Geneva, Zurich, Moscow and Osaka. Paperless boarding is also expected to be introduced at additional international airports, including Frankfurt, Tokyo Narita and Hong Kong in the coming months.