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If you think about it, the airlines are pretty smart and are not going to make it easy for anyone or any site to have access to advanced, cheap fares. They are barely hanging on now as it is, and fares are pricey these days. Planes are full, too. Giving everyone easy access to the cheapest fares would put them out of business overnight.

I fly quite a bit, and am always looking for cheap fares. I've found that if I enter alerts in all the popular flight sites, I can keep a lookout for good deals just by skimming through the flood of email alerts I get every day.

I also use flights.google.com extensively. It has some great tools to explore fares to various areas on various dates. I love that site.

What I would really LOVE to see is something that would allow me to search a bit obtusively. Something like this scenario:

I want to fly out of Billings, MT some time in the next 15 days to some place with a beach within 30 minutes and a mean average temperature of at least 72F for less than $500 roundtrip per person. I would kill for an app like that!