The Ritz-Carlton has introduced the World Concierge on Foursquare, a new service offering local tips from the concierges of its hotels to mobile-device users who visit the profile of the hotel brand on the location-based social media site Foursquare.com.

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The Allegheny County Airport Authority & Grant Oliver Corporation have launched a new mobile website, flypittsburgh.mobi, for air travelers who are looking for timely information for Pittsburgh International Airport.

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Alaska Airlines and Horizon Air have introduced paperless, electronic boarding passes in seven cities and have also launched a website for mobile devices, mobile.alaskaair.com.

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