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http://www.southwest.com/about_swa/terms_and_con.html They don't allow it.

I wonder if they can get around that by knowing the information, but not explicitly displaying it. For example, if one does a search and Hipmunk knows that Southwest has a plane scheduled at that time then they can provide a link to the Southwest website and a suggestion that "Southwest might have a time that's good for you." with a little "[?]" box beside it explaining that Southwest prohibits Hipmunk from explicitly displaying their info.

Obviously, another way would be Hipmunk getting authorization to use Southwest's data from Southwest.

Agreed. Even if you can't include certain low-cost carriers, any information that you could provide about these flights would be better than any other site has attempted, and would make your search results that much more useful. If I understand correctly, the actual flights don't change too often, so if you could simply put somewhere in the sidebar that Southwest (or RyanAir or whoever) provides a flight for the same route, it would be fantastic.

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