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Do you know what they are using under the hood?

Here’s an interesting podcast ep about flight data: https://www.kassenzone.de/2019/08/04/wer-gewinnt-bei-flugsuc...

Intro text is German, audio and transcription are English

Thanks, that sounds very interesting - will check it out!

I think most of them either still use old versions of ITA software (it was sold like traditional software, not an ongoing license), or they're rolling their own.

how do you know this?

Sabre[1], ITA and others. (Worked at one of Hipmunk, Kayak, Expedia, etc)

[1] https://beta.developer.sabre.com/guides

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