Oh wow this is some rookie coding:
You can change destination/origin to get the raw result of prices.
Additionally the whole site is delivered in a weird way, some very interesting info delivered to the browser:
Free seats : 24 - wonder how true this is?
Class Code - Q? Is this the first time we are seeing bonza fare classes?
Granted they often aren't as easy to find/manipulate as this Bonza one, but I'd wager that just about every website you regularly use would rely on APIs like this to function. Modern day websites are much more efficient to serve to a user by pumping the raw data to their brower and for the rendering to happen at their end (client side) than it is for the site to be packaged up on the website's end (server side) and sent to the user in a static form.
By way of example/comparison, the flight availability API on VA's website serves up some equally interesting data fields that aren't always visible to the user on the website (I am using the 'Inspect' tool in Chrome, which you can access by presing CTRL + ALT + I).