This Ruby gem is for the FlightStats Flex APIs. FlightStats offers an extensive range of travel and flight related data, all available for access with this Ruby gem. The documentation contains example code and instructions for implementation.
Transports Publics Genevois (TPG), the primary public transportation system operator of the Geneva area, Switzerland, has officially launched the TPG Real-Time Open Data API which provides programmatic access to real-time, hourly TPG data such as commercial stops, traffic information and next departures.
Travel reservation site Expedia starting working on its Expedia API back in 2009, according to the changelog. It has three APIs, covering hotels, flights and cars. Don't be shy. Expedia has been expecting you. The Expedia developer site has all the warmth and care of a fine bed and breakfast. They clearly want to invite you in, make you comfortable, and get your development project of the ground. Though they do have a couple hoops to jump through, as well.
There are many ways to travel and experience new places, and it doesn't always have to include impersonal and expensive hotels. Imagine having your own warm, more personal space when you travel; a home away from home that cuts travel costs as well. This is the concept behind 9Flats. It's a service that connects those who have a room, apartment or house to rent with those looking for more personal, affordable, alternative accommodation. The 9Flats API makes this functionality available to third party developers who may want to integrate it with other applications.