title: Where can I get up-to-date airline, flight, route and price data?
body: <p>Where do sites like Expedia, Orbitz, Kayak, Bing Travel, etc. get their airline schedule data? E.g. if I was going to build some sort of site to find air travel, what data sources exist that I can use?</p>
  
  <p>I've found <a href="http://www.openflights.org/data.html" rel="nofollow noreferrer">OpenFlights.org</a> so far but this won't get me pricing information and it doesn't have actual flight information (e.g. information for a particual flight number - just the routes) so I can't tell where the layovers, etc. are.</p>