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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.

Joe Germuska
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Lola Loulita
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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 https://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 http://stackoverflow.com/questions/10680408/is-there-any-api-for-getting-flight-fare - fare information will usually have the # of seats available – Mark Silverberg Apr 26 '15 at 19:11

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Just thought this might help anyone... https://www.airport-data.com/api/doc.php also provides API. you might have to sign up but its free. data is not real-time, so not to be used for flight travel

linkonabe
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    this seems to have airport and aircraft info, but nothing related to flights. It would be an appropriate answer here: https://opendata.stackexchange.com/q/3850/1511 – philshem Jan 05 '21 at 10:37