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This is a significant subset of what ITA does though - just a list of what flights go on each day of the week and at what time. I expect that can be built for significantly less than 700 million, certainly among the popular airports that most people search for. I suspect they might have had it before the ITA purchase as well but not 100% sure. The Google flights search with pricing and custom dates and routes came after ITA was bought I think.

It's basically QPX. Not just flights and times, but prices as well. It is the most significant part of ITA.

Flights, times, and fares is deceptively hard to get right. There's a reason there are only a few providers.

Edit: Ahh. If you're saying DDG could get by with just flights and times, and no fares, I see what you mean. That seems to be reflected in the pricing for the FlightStats product vs Google's flight/times/fares API pricing, yes. Parity with Google search requires fares though.

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