Airbnb's CEO, Brian Chesky, hinted that Airbnb may soon open an API for third party integration. Chesky envisions the company shifting from a marketplace to a travel platform upon which third parties can plug into. While no specifics were given, Chesky suggested that lack of an API is a hole.
Our API directory now includes 44 booking APIs. The newest is the WuBook Wired API. The most popular, in terms of mashups, is the Rezgo API. We list 5 Rezgo mashups. Below you'll find some more stats from the directory, including the entire list of booking APIs.