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We would like to run (for private, non-commercial) research purposes only a scraper that makes a multi city search on http://matrix.itasoftware.com/. The search tests about 2.8k airports for valid results. We want to input 3 legs i.a. FRA-IAD, IAD-FRA, FRA-HAM and respective dates. Scraper returns the cheapest price only.
Maybe it is possible with JSON.
Please note ITA Matrix takes you through several clicks but we'd select always the cheapest option.