The Tripian City List Curl Sample Code demonstrates how to interact with the API to access over 200 cities world-wide. Each city has a unique id (city_id) to create trips, trip-related questions, and get quick recommendations.
BCD Travel recently introduced its SolutionSource Developer Hub. The developer hub arms developers with access to five APIs and data extracts that enable clients to build custom travel solutions for their company and pull/analyze their own company travel data. Those interested can apply for access.
Our API directory now includes 134 travel APIs. The newest is the TakeABreak API. The most popular, in terms of mashups, is the Kayak API. We list 12 Kayak mashups. RESTful APIs are the most popular. Below you'll find some more stats from the directory, including the entire list of travel APIs.