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I really like the visualization and the sorting by "agony", but there's a few features Kayak has that are must-haves in my mind:

* Flexible dates. Sometimes I have a day or 2 of leeway, and it's often a lot cheaper to fly one day different.

* Flexible airports. I live roughly equidistant from 2 airports, and Stanford also has 2 reasonable airports to use.

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It's not amazingly obvious, but you can do flexible airports by putting in an area code or city that is between airports in to/from fields. i.e. if you do from:"palo alto" to:"salt lake", it will show flights leaving both SFO and SJC that go to SLC.

Something else interesting I noticed is that it seems to also return results for Amtrak.

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