However, there is a different type of travel which is "I have a little extra money sitting around, i'd love to travel"
When you don't have a predetermined destination, this interface is incredibly useful.
In fact, I often use Kayak to figure out which airport I should fly into. For instance, if I'm traveling through countries X, Y, and Z and I don't care what order I visit them in, I can quickly check which one is the cheapest to fly into.
However, there is a different type of travel which is "I have a little extra money sitting around, i'd love to travel"
When you don't have a predetermined destination, this interface is incredibly useful.