Cant tell you regarding LH
/BA/AF - can only give you a rough indication for Austria:
Ticket Agent around EUR 28000 gross, same for a ramp agent per year.
Mech people around 35000 EUR/year gross.
Depends on seniority.
Flight Attendants with OS
Group usually start at EUR 24000 gross/year, withn "FlyNiki" HG
around EUR 21000 gross/year.
Dont be too shocked now - the big difference is our system of taxation as well as social security. When you deduct about 30% of the gross then you have fully paid for income tax, pension funding, health insurance and unemployment insurance. So the Ticket Agent has around 1400 EUR/Month net 12 times plus 2 additional salaries paid end of June and end of November (those are called "holiday-" and "christmas remuneration").
Still the salaries are quite low but I would call them average. In addition airline employees have the usual benefits from working with airlines like travel benefits for themselves and their families, sometimes free travel to the workplace with company busses or do get very cheap tickets for the public transport, and so on. In addition people have 5 weeks (35 days) paid holidays per year plus at least 6 public holidays per year bringing holiday to a total of minimum 40 days/year.
Working on sundays/public holidays (which is usual for airline employees) mean 100% overtime payment plus the time you have worked 100% additional compensated as free time.
Hope this helps - at least what the situation in Austria is. Germany (LH) is not too much different from the social background - the salaries will be higher - but someone from Germany can answer this question better....
Have a nice weekend