The challenge is that not only do you have to really nail it with the "one bullet", but you probably also have to prove it as well. Just coming up with the best answer might not be enough, because people don't trust travel sites to do that. How do you earn trust? You have to convey the sense of an exhaustive search encompassing all the best-known airlines (especially the budget ones), all the available fare types, and flight times. It's almost like putting together a business case for the trip. "Here's the recommendation, based on all these different things we considered."
