Where can I find a free web service, or data available in XML format, to check for flights availability? Something like OpenFlights to which provides airport data.

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    I don't think you're going to find a free source of this information. I have heard that that ExpertFlyer.com can provide an API but it's for volume users. Also, Google's developers.google.com/qpx-express/v1/trips/search has a field for this in their response (bookingCodeCount) and gives you 50 free queries per day. – Mark Silverberg Apr 26 '15 at 19:10
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    You might also look at stackoverflow.com/questions/10680408/… - fare information will usually have the # of seats available – Mark Silverberg Apr 26 '15 at 19:11
  • Airline staff that can fly non-revenue standby need to use an app like stafftraveler.com to get loads, so the chance that there is a multi-airline open API is negligible – philshem Feb 18 '19 at 14:40

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