Expanding on this, one of the things ITA/QPX comes with is a dirty big availability cache that's constantly being primed (and paid for) by their customers (ie:

Expanding on this, one of the things ITA/QPX comes with is a dirty big availability cache that's constantly being primed (and paid for) by their customers (ie: Kayak, Orbitz, et al), who are now ironically not getting any traffic from Google :) And they have this: http://itasoftware.com/pdf/BrochurePDF_DACS.pdf http://itasoftware.com/pdf/BrochurePDF_DACS.pdf