It depends. Usually, at some level you're going to find some crazy complexity. I think just about every flight hacking/booking website is simple in the sense th

It depends. Usually, at some level you're going to find some crazy complexity. I think just about every flight hacking/booking website is simple in the sense that it just uses one API for data, but then there's complexity in the UI and behind the API they're using. Likewise, prpviding just an API to some otherwise unavailable data might be anywhere from simple to inifitely complex.