Since fairfly.com excluded them self to only cooperate customers is there a similar Plattform for private travelers you know of?

Somebody told me about this site and said it helped him a lot.  I've not used it, but may for my upcoming trip.  Is that what you were looking for?

 

https://www.travelcounsellors.co.uk/gb/leisure

Fairfly - is/was a page which would offer you improved prices even after you bought your ticket already- they would issue a new ticket and take a small fee on what you saved. Guess the biz concept was to troublesome for private customers but makes sense for cooperates. Just couldn't find anything like it and thought one. Of you might use a similar tool.