ryanair
As long retired SLF I have flown with Ryanair a few times and don't
much like them. However they are cheap, for example I have to go
southern Spain to Lindau later this year, I can fly with Ryanair to Stansted
and then to Friedrichshaven for not very much, any other way would cost
literally hundred of euro's more. I suppose the cost of operating the aircraft
is much the same for any modern low cost airline, so the real saving
must be somewhere else. Whats left apart from manpower ?
hint: when I started my career the main costs were in hardware
when I retired they were in human costs.