@Svetlana16, a lot what you write about has been true, in the past, for KTV Lufthansa (Lufthansa mainline, cargo, germanwings). However, those jobs are right now being slowly outsourced into Eurowings Europe. There have been no new entries into the KTV world for the last few years, and there won't be any in the future, except if something fundamental changes within lufthansa management.
But Lufthansa has hired ready entries whenever their own flight schoold (and KLM) couldn't provide enough cadets, so there are quite a few ready entries flying in lufthansa, and yes, they do not have a course number, but do have the same rights and possibilities like everybody else, with the exception of some very few old germanwings captains that are locked into that airline.
The german employment market is a mess right now, although there are quite a few jobs to be had. airberlin is hiring as fast as they can train, eurowings europe does the same, with a very real possibility for a fast upgrade, especially with a few hours jet exprience. However, the contract state for eurowings europe will be austria, not germany, even if based in germany.
Nearly the whole german aviation market is under the influence of lufthansa currently, either directly or indirectly. And it is not a good influence, they do put massive pressure on terms and conditions, via incredibly bad t&cs at Eurowings Europe, Sunexpress germany and now they put a lot of pressure on airberlin as well. TUIfly is under pressure as it is being sold to a joint venture of TUI and Etihad, with the principal AOC held by flyNiki with extremely bad conditions, the new benchmark for TUIfly.