People complain a lot about Norwegian Air International paying low salaries. As far as I know a captain on 787 get get 9000 Euro net.
There's the problem with taxes for many since the employment form is quite... creative.
An Airbus A330 captain with SunExpress Germany (Eurowings livery) has about 6800 euros, before German tax!
The net salary is roughly a little bit more than half of what a WB F/O makes in the ME. The Eurowings-gig only seems to attract people who wants to live close to Cologne.