I wonder how much of the old Lisp codebase is left.

Also, it looks like the Matrix might go extinct soon:

> This interface runs on a deprecated web platform. At some point in the near future, we will be forced to shut it down. We unfortunately do not have a timeline on when this will happen. We welcome feedback about features missing from the new interface, we read all feedback and open bugs accordingly.

it's pretty horrible, I just search my vacation destination and it doesn't have LCC Wizzair I'm flying with in Europe = useless search tool

At least on my searches with Google Flights, Wizzair shows up as a carrier for EU flights. Good search engine for low cost EU carriers is https://www.azair.eu/

Azair doesn't really work either anymore, they will show you non-existent flights or wrong prices, for rough idea is OK, but data is wrong

That's on the LCC, not the aggregator. They don't want to pay commission, and that's fine. If you want to fly on them you have to actually go on their website.

I don't really care who pays who, but search engine which can't find me cheapest flights it's useless

Well, you're getting it free: if you don't get any use from it, don't use it. Try doing an iterated search of every possible route on every possible airline website and let us know how you get on!

1. just because something is free it's not excuse to provide poor service

2. I don't use it, I point out for others facts about service OP recommends so they don't waste their time or you prefer everyone wasting their time?