Many thanks to paul21, Steppo and 18sas for this brilliant script! I'm rookier than rookie with scripts, but managed to get this up and running.

Just on the point about booking classes - I searched a CX/AC itinerary in specific (semi-flexible economy) buckets, something you of course can't do on (most/all?) OTAs. Although it brought up cheaper buckets on Orbitz and Cheaptickets, it actually brought up the exact fare buckets on AC's site. Beautiful!

Didn't get any results at all on the links via the Farefreaks links - have only tested my above itinerary which had been problematic on almost all OTAs I tried anyway. e.g. it would appear on Kayak as bookable on Expedia, but when clicking through to Expedia it would always return an error message, regardless of the Kayak/Expedia country site used. So may well just be an issue with this itinerary, will play around.

The seatguru and planefinder functionality is a cool touch too.

Thanks for your generosity!