Flight price tracker Yapta's value proposition sounds a bit like Robin Hood of the travel industry. It will not only track travel prices for you, but to help you get a refund should the price of your reservation fall after you’ve booked it. I wouldn’t be surprised if Yapta can also be used to retrieve kittens from high branches, but that part of the Yapta API isn’t documented yet.
WestJet, a low-cost Canadian airline, has announced that iTravel2000 intends to integrate the WestJet Direct API to book and ticket air travel. In addition to the API integration, iTravel2000 will become a WestJet-certified conforming channel early next year. The certification will permit iTravel2000 to continue access to WestJet's best possible prices and ancillary products.
Travel booking giant Expedia, through its Expedia Affiliate Network, has launched EAN Rapid, a new platform for travel accomodation search and booking. The platform contains a number of APIs, including Geography, Shopping and Booking APIs, that affiliates can use to build booking applications.