What I still have problems to understand with, who really used QPX Express? I looked at it several times over the year and it basicially only lets you search fo

What I still have problems to understand with, who really used QPX Express? I looked at it several times over the year and it basicially only lets you search for flights (oneway, roundtrip, open jaw) but without any "advanced routing codes" But those are the most important ones since you can specify booking class (not to be mistaken with cabin class), operating, marketing carrier, base fare code, layovers, aircraft type,... Basicially QPX Express was always a paid and also very limited version of matrix.itasoftware.com Instead the results were much better (and free) just scraping ITA and being able to enter all those advanced routing codes. Great way for finding error fares, fuel dumps, ... And there was no spam check from google's side, no IP request restrictions, no limit, nothing, whatsoever. The code is a bit hard to go with when they changed to ITA v3 but once you figured it out (and it took us only 2 days since we had a working scraper for the previous version) to adjust it to the new code.