Instructors should be on the higher end of the pilot payscale.
However it has always been the way it is now and probably always will be.
There are a few exceptions to the low pay scale in instruction and that is those of us who specialize and can charge a fair amount. Unfortunately this group is way to small and flying school instructors continue to work for below living standards wages, how sad for the industry.
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The hardest thing about flying is knowing when to say no.