Even though Alaska Airlines was one of the first airlines to offer an iPhone application, allowing travelers to check-in and use their phone as mobile boarding pass, early efforts were essentially just "screen-scraped" from the companies website, providing a very poor user experience, not really delivering on the process of the mobile web. Since you're a ProgrammableWeb reader, you can probably guess what the company needed. After all, mobile has fueled API growth.
When looking for a place to live, the surrounding area matters. Knowing if the property has easy walking access to shops, places of interest or public transport can definitely sway a buyer's purchasing decisions. Walk Score is a service that measures walkability within specific locations and also provides neighbourhood maps to the real estate industry. Walk Score's Travel Time API makes this functionality available to be easily integrated with other applications.