Came here thinking I'd find out the answer. Can you add the "Ask HN:" prefix, as well as a question mark? Anyways, a start from Hipmunk FAQ (though no exact ca

Came here thinking I'd find out the answer. Can you add the "Ask HN:" prefix, as well as a question mark? Anyways, a start from Hipmunk FAQ (though no exact calculation mentioned): "What is Agony, and why would I want to sort by it? We know that price isn't the only factor that goes into purchasing a flight. While other sites sort by price, Hipmunk automatically sorts results by "Agony," which is primarily a combination of price, flight duration, and number of stopovers."